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aleksandr82 [10.1K]
3 years ago
11

In cellular respiration, a series of molecules forming an electron transport chain alternately accepts and then donates electron

s. What is the advantage of such an electron transport chain? A scheme of cellular respiration. The initial compounds are 2H obtained from food via NADH and half of O2. 2H transforms into 2H plus and 2 electrons. These products have lower free energy than 2H and half of O2. Electrons lose their free energy in the electron transport chain. This energy is used for ATP synthesis. 2H plus and half of O2 lose their free energy and react with two electrons from the electron transport chain to create a water molecule that has less free energy than all the reactants. In cellular respiration, a series of molecules forming an electron transport chain alternately accepts and then donates electrons. What is the advantage of such an electron transport chain?
Biology
1 answer:
Elanso [62]3 years ago
7 0

Answer:

Release of electrons from reducing powers to O2 via four protein complexes allows release of small amount of energy at each step and makes the process energy efficient.

Explanation:

If NADH and FADH2 would reduce O2 directly, a large amount of energy would have been released in a single step. On the other hand, oxidation of these reducing powers through a series of electron carrier release a small amount of energy at each step which in turn is temporarily stored in form of proton motive force across the inner mitochondrial membrane.

Transfer of a pair of the electron to O2 pumps four protons by complex I, four by complex III and two by complex IV. The resultant proton motive force effectively stores the energy of electron transfer. This energy is then used to drive ATP synthesis.

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After Frida stops exercising, she continues to breathe heavily. What is most likely occurring in her body?
Brilliant_brown [7]

Answer:

(D) Strenuous exercise has caused her body to be in oxygen debt, and she is breathing hard while lactate is transported to the liver. This is a result of anaerobic respiration.

Explanation:

As Frida was exercising, her muscle cells were undergoing a frantic pace of metabolism (contraction and relaxation), where oxygen supply did not supply the required effort, thus causing muscle fatigue and heavy breathing.

Physical activity is synonymous with moving muscles. The more muscle fibers strive to accomplish a task, the more they consume the oxygen brought into the bloodstream. When this occurs, the body begins to breathe hard as lactate is transported to the liver.

This forces the lungs to work at a fast pace, as they are responsible for oxygenation. The heart also speeds up because it needs to pump blood more vigorously. This is why during exercise the heart rate and breathing rate increase and we breathe heavily.

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4 0
3 years ago
Enter the correct term in the blanks.
Amiraneli [1.4K]

Answer:

a. veins and arteries

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e.4

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j.buccal cavity ,saliva

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Explanation:

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