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klemol [59]
2 years ago
8

For a neuron to function, an input of free energy from ATP is required to set up the sodium and potassium ion concentration grad

ients such that a signal can be propagated down the axon of a neuron without the necessity of ATP. The system could have worked the opposite way. The neuron could have used ATP to move ions across when a signal was being propagated and then allow natural diffusion to return the ions to their respective sides of the membrane. What advantage does the organism have using ATP up front
Biology
1 answer:
Vlad [161]2 years ago
4 0

Answer:

The lack of ATP would slow nerve responses to generate an action potential

Explanation:

Adenosine triphosphate (ATP) is the main source of energy in the cells. Moreover, ATPases are pumps that use ATP in order to transport sodium and potassium ions across the cell membrane and thus create an action potential. In stressful situations (e.g., escape from a predator) the lack of ATP would not allow to develop fast nerve responses, thereby ATP is required during rest periods and the flow of ions is used when is required a fast response.

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Find the volume of a sphere with a diameter of 12 centimeters
Kitty [74]

Answer:

V≈904.78cm³

Explanation:

The volume of a sphere with a diameter of 12 centimeters is 904.78cm³.

Formulas: V=4/3πr³ and d=2r

V=1/6πd³=1/6·π·12³≈904.77868cm³

7 0
3 years ago
Read 2 more answers
The volume and mass of the brain has increased about threefold from early human ancestors such as Australopithecus afarensis, to
spin [16.1K]

The question is incomplete as it does not have the options which are:

A. The threefold change happened in one concentrated burst.

B. The change was not consistent in direction, but happened in multiple bursts concentrated at each speciation event.

C. There was consistent directional selection toward a larger brain all along the lineage between the two species.

D. None of the above.

Answer:

Option-B

Explanation:

The hominids evolved with time and the known hominid in modern time is the Homo sapiens or modern human.

The Homo sapiens like other species could have evolved from the older species through speciation and studies suggest that one of the major factors of human evolution is the size of the brain.

Two possibilities could explain the size of the brain that it could have evolved slowly with time called the gradual equilibrium or in bursts concentrated at each speciation event.

Since the punctuated equilibrium takes place in bursts until the species reach stasis is the most applicable condition for punctuated equilibrium to happen therefore Option-B is the correct answer.

3 0
2 years ago
Which of these processes are driven by energy from Earth's interior?
Angelina_Jolie [31]
I believe it’s B but I’m not sure sorry
4 0
3 years ago
The DNA in a cell's nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well
hammer [34]

Answer:

PFK

nucleus-->cytoplasm-->ER (ribosomes, translation will occur)-->Golgi body(for packaging)-->cytoplasm (specified compartment inside the cell)

insulin

nucleus-->cytoplasm-->ER (ribosomes, translation will occur)-->Golgi body(for packaging)-->outside the cell.

Explanation:

considering PFK (Phospho Fructo Kinase), for the nucleus the mRNA will be transferred to the cytoplasm on the (RER) rough endoplasmic reticulum the mRNA will be translated on ribosomes, then the packaging will be done inside Golgi apparatus, and then the protein inside the vacuole will be transported to the specialized compartment. in the case of insulin the process will be same but the desired target will be blood hence it will be transported out of the plasma membrane of islets of Langerhans  into the blood capillaries.

8 0
3 years ago
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Bond [772]
The left side of the heart is receiving blood from the lungs via which has just been replenished with oxygen
The right side of the heart is receiving blood from the body via which has used up the oxygen.
5 0
3 years ago
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