Answer:
The slow depolarization of the pacemaker cells is caused by the opening of the non selective cation channels.
Explanation:
Pacemaker cells are specialized cardiac muscle cells with the task to create the rhythmic pulses that make the cardiac muscle contract properly, functioning as a whole and not as independent contractile cells.
One of the things that differentiate pacemaker cells from regular cardiomyocytes is that pacemaker cells slowly depolarize by themselves. This happens because when these cells are in phase 4, in a state of hyperpolarization, the 'funny current' appears to begin depolarizing the cell again.
Hyperpolarization usually occurs because there's an outflux of potassium ions (which makes the inside of the cell much more negative than the outside of the cell) but, in pacemaker cells, the membrane becomes less and less permeable to potassium, which ends up decreasing the outflux of this ion. Along with this change in potassium's electrical conductance, the funny current increases the permeability of sodium, which means that there's also a sodium influx happening at the same time, helping in the depolarization process.
This mixed sodium and potassium permeability is one of the key features of the funny current, and is possible thanks to the opening of non-selective cation channels in the membrane that allow the passing of any cation following their specific chemical gradients.
An ecosystem consists of a community of living organisms
1. ___________________________ with each other and the 2._____________________________. The source of energy that fuels most ecosystems is the 3.___________. Plants use the Sun’s energy to produce food in a process called 4.________________________________.
Organisms that use energy from the Sun or energy stored in 5._________________________ compounds to produce their own nutrients are called autotrophs. They are also called 6.________________________ because most other organisms depend on autotrophs for 7._______________________ and 8._____________________. Heterotrophic organisms that can’t make their own food may obtain nutrients by eating other 9.___________________. A heterotroph that feeds only on plants is called an 10._________________________________. Herbivores are also called 11._______ order heterotrophs. 12._________________________________ that feed on other herbivores are 13._______ orde
Answer:
1. interactions
2. environment
3. sun
4. photosynthesis
5. chemical
6. producers
7. food
8. energy
9. organisms
10. herbivores
10. first
12. Heterotrophs
13. second
Explanation:
An ecosystem consists of a community of living organisms interacting with each other and the environment. The source of energy that fuels most ecosystems is the sun. Plants use the Sun’s energy to produce food in a process called photosynthesis.
Organisms that use energy from the Sun or energy stored in chemical compounds to produce their own nutrients are called autotrophs. They are also called producers because most other organisms depend on autotrophs for food and energy. Heterotrophic organisms that can’t make their own food may obtain nutrients by eating other organisms. A heterotroph that feeds only on plants is called an herbivore. Herbivores are also called first order heterotrophs. Heterotrophs that feed on other herbivores are second order heterotrophs.
Keystone species are those that are a necessary component to the stability of the ecosystem, and without them, many
other organisms would not survive and the ecosystem can collapse. Which of these is NOT an example of a keystone
species and the role it plays in Georgia's ecosystems?
-0)
A)
beaver; their dams create small ponds to help other species have a place to
Live and helps to stimulate the growth of plants
B)
kudzu; kudzu was introduced from Japan as an ornamental plant, and the
Civilian Conservation Corps used it to help reduce soil erosion
alligators; their tails dig holes that hold water during times of drought, and
this water is used as a source for drinking water by many species
D)
red cocaded woodpecker; they drill deep nests into Georgia's pine trees,
and when not in use by the woodpecker, many other organisms will use
them
Answer:
The correct answer is - option C. alligators; their tails dig holes that hold water during times of drought, and this water is used as a source for drinking water by many species.
Explanation:
Beavers are keystone species as they help other species to get habitat and also help plants to grow by the holes or dams they make. Kudzu is a keystone species of an ornamental plant which lowers the soil erosion in their abundance.
Red cocaded woodpecker is a keystone species as they create pits in the pine trees that are helpful for other species to live.
Alligators also keystone species but not for digging holes and hold water but the influencing the prey and maintaining the animals in the ecosystem.
Answer: B
Explanation: USATestPrep
Scientists find the same type of index fossil in two different locations on Earth. What can they conclude from this discovery?
A. The fossils are different ages due to the location.
B. The index fossils are the same geological age.
C. One index fossil is older than the other.
D. There is not enough information to make a conclusion.
2
Answer:
(B.) The index fossils are the same geological age.
Explanation:
When they are the same fossil, but in two different locations we know that they are both most likely the same age.
What method of forecasting uses the effects of past weather conditions as part of its forecasting method? A. Persistence method B. Analog method C. Climatology method D. Trends method
Answer:
analog forcasting
Explanation:
Answer:B
Explanation:Analog method
Which organelle found in plant cells allows them to make food using sunlight?
lysosome
chloroplast
Golgi body
nucleus
Answer:
Chloroplast
Explanation: Its choloroplast since chloroplasts are sites where photosynthesis takes place.
Please mark as brainliest if you want!
Answer:
its chloroplast
Explanation
I got it right and because Im smart like that.
Use the image on the right to answer the following questions Compared to the outside of the cell, the inside of the cell is
hypertonic
isotonic
hypotonic
Answer:
Isotonic
Explanation:
It is isotonic because the liquid/molecules appear to be flowing in and out of the cell evenly. A hypertonic solution would mean the cell would shrink because there would be less liquid/molecules inside the cell compared to the outside. A Hypotonic solution would be a greater concentration of the liquid inside the cell compared to the outside, the cell would lyse or burst
Answer: hypotonic
Explanation: it just is
How is cellular respiration
connected to our muscular
system?
Answer:
Cellular respiration is a key role in returning the muscles to normal after exercise, converting the excess pyruvate into ATP and regenerating the stores of ATP, phosphocreatine, and glycogen in the muscle that are required for more rapid contractions.
Hope that helps!
Gametes come from germ cells. They are also called (Choose ALL possible options to receive
credit, Hint Pick 4) * r
Sex cells
Sperm cells
Somatic Cells
Diploid Cells (2n)
Haploid cells in
Egg Cells
Answer:
Gametes are an organism's reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm.
Explanation:
So, answers = sex cells
Sperm cells
egg cells/ova
Hope this helps u
Crown me as brainliest:)
Which of the following is an example of a lipid?
phospholipid.
triglyceride
fats and oils.
all of these
Answer:
phospholipid
Explanation:
Phospholipids, triglycerides, fats, and oils are examples of a lipid. Therefore, option D is correct.
What are lipids?Fatty, waxy, or oily molecules are referred to as lipids. They are soluble in organic solvents but insoluble in polar solvents like water. Steroids, phospholipids, oils, and waxes are examples of lipids. They are usually referred to as fats and oils.
Since lipids may be broken down to provide significant amounts of energy, one of their primary biological purposes is the storage of energy. The structural elements of cell membranes and a number of the body's messengers and signaling molecules are also formed by lipids.
Cell membranes, cholesterol, blood cells, and the brain are just a few places where they can be found in the human body.
Learn more about lipids, here:
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Which of the following organisms is LEAST able to extend its geographical range in response to climate change? robins polar bears conifers butterflies
Answer:
The correct answer is: Polar bears
Explanation:
Mong the given four option polar bears are last able to extend their geographical range in order to deal with climate change as they are not able to survive on land with hot temperatures and prey found in these regions. They can not survive for longer periods of time without sea ice and cold temperature.
Sea ice helps in finding their food and without sea ice, it will also greatly affect, it is one of the reasons their population decreasing as the Arctic are rising and the sea is diminishing.
How do the immune system and digestive system work together?
The immune system works with the digestive tract to help protect you from infection by these potential invaders. Your immune system also depends upon cells to kill invading organisms, and chemicals that don't require the involvement of cells at all, but which are simply toxic to bacteria and viruses. Acid in the stomach does the same thing.
Scientists apply, evaluate, and analyze information in a systematic way to develop a logical answer or conclusion. This process is called __________.
A)
brain storming
B)
critical thinking
C)
deduction
D)
experimentation
E)
inferring
Answer:
B) Critical thinking
Explanation:
Science involves solving problems and answering questions. One of the ways employed by scientists is CRITICAL THINKING. Critical thinking is the method in which scientists base their conclusion about an occurrence on the careful or systematic application, evaluation, analysis of gathered information.
Critical thinking entails giving ideas rational thought before arriving at the best solution. Hence, before a logical conclusion must have been arrived at, scientists who are critical thinkers analyze and apply useful information.
Answer:
Critical thinking is the answer
Explanation:
How do microorganisms contribute to the health and characteristics of soil?
Plz help!
Answer:
decomposition
Explanation:
microorganisms help decompose, or break down, other organic matter, that is no longer needed. For example, a dead critter on the ground.
What are the complementary base pairs of RNA?
Answer:
there you go
Explanation:
adenine(A),
uracil(U),
guanine(G),
cytosine(C)
A=U, G≡C
Lactic acid fermentation is a type of anaerobic respiration that occurs in organisms such as:
1) Bacterial Cells
2) Animals
3) Yeast Cells (fungi)
4) Plants
Answer:
animals
Explanation:
lactic acid fermentation occurs when there is not enough oxygen to make aerobic respiration. glucose will be converted into pyruvates and those pyruvates will become lactates to reduce NADH to NAD+
Lactic acid fermentation is a type of anaerobic respiration that occurs in organisms such as bacterial cells.
What is anaerobic respiration?The term "anaerobic" means "without oxygen". There is no need for oxygen in this type of cellular respiration to produce energy. Smaller creatures require energy to survive in the lack of oxygen since there is not enough oxygen available for them to breathe.They engage in anaerobic respiration, which they use to generate the energy they require.What is lactic acid fermentation?Lactic acid fermentation is a metabolic process that converts one molecule of glucose to two molecules of lactic acid. It occurs in the cytoplasm of the cell.Bacteria convert pyruvic acid into lactic acid when anaerobic conditions, or conditions without oxygen, exist. Not much energy is released throughout this process.
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What molecules are needed to make the chemical reaction that is called
Answer:
reactants, and the substances produced at the end of the reaction are known as the products.
Activity
EXplain why a complex food web is better than a simple food chain for the survival of the community.
Answer:
A complex food web is better than the simple food chain because the food web links together the relationships between a producer, consumer, and decomposers. Another reason why a complex food web is better than a simple food chain is that if a particular species is eliminated from a food web, the entire ecosystem has a lower chance of collapsing due to that loss. A food web can more readily react to changes in the environment that impact one or more species.
Hope this helps :)
Answer:
(Answers may vary.)
A complex food web is more important than a simple food chain for the survival of a community. The food web is more important because it is more intricate and adaptive than a food chain. A community houses many species. These species are dependent on each other for energy and food. So, there are multiple relationships of energy transfer involved.
A food chain is linear, which means that each predator has only one source of food. So the predator is vulnerable if the food source is depleted through disease or a change in environmental conditions. Whereas in a food web, each predator has many food sources. A complex food web provides multiple preys to species at a higher trophic level. As a result, a food web illustrates the feeding relationships between many species at different trophic levels in an ecosystem.
Explanation:
Answer for plato
Your friend is taking a Genetics lab at UT. She needs some help with a lab report so she calls you for some advice—she knows you will be able to help since you are taking Genetics. After analyzing data from a three point cross she has lost her lab manual. The only thing she can find is that the Interference in this cross was 0.68. She remembers a testcross was done with a heterozygous female and that the genes being analyzed were forked bristles, crossveinless wings, and white eyes. She also tells you that there is an equal distance between these genes. What is this distance if she counted 3 double crossover progeny out of 500 total progeny?
Answer:
The distance between these genes is 0.9375 MU
Explanation:
To calculate the coefficient of coincidence, CC, we must use the next formula:
CC= observed double recombinant frequency/expected double recombinant frequency
Note:
observed double recombinant frequency=total number of observed double recombinant individuals/total number of individuals expected double recombinant frequency: recombination frequency in region I x recombination frequency in region II.The coefficient of interference, I, is complementary with CC.
I = 1 - CC
Available data:
• Interference = 0.68
• Equal distance between genes
• 3 double crossover progeny
• Total number of individuals in the progeny, N = 500
We know that
CC= observed double recombinant frequency/expected double recombinant frequency
CC = (total number of observed double recombinant individuals/total number of individuals)/( recombination frequency in region I x recombination frequency in region II)
I = 1 - CC
So, all we need to do is to clear each formula with the data given in the problem:
I = 1 - CC
0.68 = 1 - CC
CC = 1 - 0.68
CC = 0.32
CC = observed double recombinant frequency/expected double recombinant frequency
We already know the value of CC, and we know how to calculate the observed double recombinant frequency. But we need to calculate the expected double recombinant frequency. So,
0.32 = (3/500)/(RF-RI x RF-RII)
0.32 = 0.006 / (RF-RI x RF-RII)
(RF-RI x RF-RII) = 0.006/0.32 = 0.01875
We know that the expected double recombinant frequency is the recombination frequency in region I multiplied by recombination frequency in region II. In this case, it equals 0.01875
We also know that there are equal distances between genes, so now we need to divide 0.01875 by 2
0.01875 /2 = 0.009375
The genetic distance will result from multiplying that frequency by 100 and expressing it in map units (MU) or centiMorgans (cM). Now we must multiply each recombination frequency by 100 to get the genetic distance
0.009375 x 100 = 0.9375 MU or cM
3. A plant cell (0.9% NaCl) is placed into a solution of 20% NaCl, the membrane is permeabl
water. What happens to the plant cell?
4. A plant cell (0.9% NaCl) is placed into a solution of 100% DI water, the membrane is
permeable to water. What happens to the plant cell?
o
w
Answer:
3. the water inside the plant cell will diffuse out from the cell following the concentration gradient. cells will be plasmolysed.
4. distilled water will diffuse into the cell following the concentration gradient. cells will be turgid
Complete the following statement
When the forearm is extended at the elbow joint, the ____________muscle acts as the agonist.
Answer:
triceps brachii
Explanation:
The triceps brachii is a muscle located at the arm. It is a posterior muscle consisting of a long, medial and lateral head which originates from the humerus. It also covers almost the entire length of the humerus.
The functions of triceps brachii are:
Extension of the forearm at the elbow joint. The extension and adduction of the arm at the shoulder joint as a result of its long head.Controls the movement of the elbow1. What is the proper order of succession?
A. climax community- pioneer species-primary succession- secondary succession
B. pioneer species-primary succession-secondary succession-climax community
(I WILL MARK BRAINLEST )! or however you spell it !!
The answer fam is......... B. pioneer species-primary succession-secondary succession-climax community
"Primary succession begins in barren areas, such as on bare rock exposed by a retreating glacier. The first inhabitants are lichens or plants—those that can survive in such an environment. Over hundreds of years these “pioneer species” convert the rock into soil that can support simple plants such as grasses. These grasses further modify the soil, which is then colonized by other types of plants. Each successive stage modifies the habitat by altering the amount of shade and the composition of the soil. The final stage of succession is a climax community"
Is the following sentence true or false? Respiration that takes place
inside of cells is the same as breathing air in and out of the lungs.
Answer:
fals..................
. How are mineral deposits formed around vents?
Answer:
When hot, metal-laden water spews from vents and mixes with the cold ocean, the metals precipitate. Large piles of sulfide accumulate on the seafloor and are eventually buried by sediments, modified by heat and pressure in the crust, and uplifted. Some are exposed on land when erosion removes the overlying rocks.
What feature of bacteria makes them more capable of causing disease?
Answer:
They reproduce quickly in your body. Many give off chemicals called toxins, which can damage tissue and make you sick.
Hope this helps!
Please help!!!!! I only have 5 minutes!!!!!!!!!
Answer:
c i believe
Explanation:
Answer:
Cell X is the plant cell
Reason
Cell X is the only cell that has a nucleus, chloroplast, cell membrane cytoplasm and cell wall.
but all the other cells one or the other of the above (as all the given organnells has to be present in a planet cell
liquid layer of iron and nickel
A:crust B:mantle C:outer core. D:inner core
Answer:
C. Outer Core
Explanation:
a good thing to remember is that the inner core is solid and the outer core is liquid
Answer:
The liquid layer of iron and nickel is C: the outer core.
Spotted salamander and algae mutualism
Answer:
They share a close bond that begins when the algae start growing in the salamander's egg–and enter the developing embryo's tissues and cells, a type of relationship known as endosymbiosis.
(hopes this helps ^^)
what does Mojave Desert and Salar de Uyuni have both in common
A. remain above freezing temperatures during June. B. are negatively affected by human interference. C. receive less than four inches of rain each year. D. have many different kinds of plants and animals.
Answer:I think C. receive less than four inches of rain each year.
Explanation:
Answer:
B. are negatively affected by human interference.
Explanation:
WHICH LEVEL OF PROTEIN STRUCTURE MUST BE INVOLVED IN FORMING THE ACTIVE SITE
Answer:tertiary and quaternary
Explanation:
Sulfur has 16 electrons. If an ion of sulfur has a charge of –2, this means that its atom has gained or lost 2 electrons
Answer:
lost i bielive
Explanation:
