Describe the process that permits a cyclist or other endurance athlete to continue to exercise even when he or she cannot take in sufficient oxygen to support the electron transport chain's continued generation of ATP


When endurance athletes cannot take in enough oxygen to meet the body's demands for the large amounts of oxygen needed to produce ATP via the electron transport chain, pyruvate remains in the cytoplasm and is converted to lactate. Lactate is then released into the blood and taken up by the liver, where it is converted to glucose via gluconeogenesis. The glucose that is formed from pyruvate can then undergo glycolysis. This sequence of chemical reactions, called the Cori cycle, provides a means by which small amounts of ATP can be produced in the relative absence of oxygen. Because very little ATP is actually produced, the Cori cycle cannot sustain vigorous physical activity for very long before the muscle begins to fatigue.

Nutritional Science

You might also like to view...

_____ can cause a child’s misbehavior and poor achievement

1.Poverty 2.Sugar 3.Food additives 4.All of these choices 5.Sugar and food additives only

Nutritional Science

Fruit provides a good source of calcium

Indicate whether the statement is true or false

Nutritional Science

Which question is best answered by using the Dietary Reference Intakes (DRI)?

A) How much of a vitamin is too much? B) Is the amount in this vitamin supplement safe? C) Is the amount in this vitamin supplement effective? D) How much of a certain vitamin is needed each day?

Nutritional Science

Pellagra is characterized by

A. dementia. B. dermatitis. C. diarrhea. D. All of the choices are correct.

Nutritional Science