Question

question 46
1 pts
during exercise, the increase in our respiration rate and heartbeat speed is driven by the need to replenish the oxygen used to support
○ the dark reactions of photosynthesis.
○ lactic acid fermentation.
○ oxidative phosphorylation in muscle cell mitochondria.
○ carbon dioxide synthesis in our lungs.

Explanation:

During exercise, the body needs more energy. Oxidative phosphorylation in muscle - cell mitochondria is an aerobic process that requires oxygen to produce a large amount of ATP. The increase in respiration rate and heartbeat speed is to supply more oxygen for oxidative phosphorylation to meet the energy demand. Photosynthesis occurs in plants, not in humans. Lactic - acid fermentation is an anaerobic process. And carbon - dioxide is a waste product, not something synthesized in the lungs for energy production.

Answer:

oxidative phosphorylation in muscle cell mitochondria.