Gas Exchange and Exercise

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During exercise, what has a major influence on the cardiovascular and ventilatory responses to exercise?

The magnitude of cellular respiration (correct)

The distribution of cardiac output to exercising muscle

The size of the physiological VD

The end-capillary PO2 in the exercising muscles

What happens to AT when the cardiovascular transport of O2 is impaired during exercise?

It remains constant

It is reduced (correct)

It is eliminated

It is increased

What are the two powerful ventilatory stimuli produced during exercise above the AT?

H+ and O2

O2 and CO2

CO2 and H+ (correct)

CO and H2O

What is the average percentage of O2 that can be extracted from muscle blood flow during maximal exercise?

85% Signup and view all the answers

What determines exercise ventilation besides the changing rate of CO2 delivery to the lungs?

The size of the physiological VD and the level at which arterial PCO2 is regulated Signup and view all the answers

What is the relationship between work rate and the distribution of cardiac output to exercising muscle?

The distribution of cardiac output to exercising muscle depends on the work rate Signup and view all the answers

What is the end-capillary PO2 in the exercising muscles during maximal exercise?

Relatively uniform Signup and view all the answers

What happens to exercise endurance when exercise is performed above the AT?

It is reduced Signup and view all the answers

What is the primary factor that determines the degree of cardiovascular and ventilatory responses to exercise?

The work rate Signup and view all the answers

What is the primary role of the carotid bodies during exercise?

To monitor arterial [H+], providing sufficient ventilatory drive to minimize the decrease in arterial pH that occurs above the AT Signup and view all the answers

What happens to PaO2 during exercise?

It normally remains relatively constant Signup and view all the answers

What is the relationship between exercise above the AT and CO2 production?

Exercise above the AT increases CO2 production Signup and view all the answers

During exercise, what has a major influence on the cardiovascular and ventilatory responses to exercise?

The magnitude of cellular respiration Signup and view all the answers

What happens to AT when the cardiovascular transport of O2 is impaired during exercise?

It is reduced Signup and view all the answers

What are the two powerful ventilatory stimuli produced during exercise above the AT?

CO2 and H+ Signup and view all the answers

What is the average percentage of O2 that can be extracted from muscle blood flow during maximal exercise?

85% Signup and view all the answers

What determines exercise ventilation besides the changing rate of CO2 delivery to the lungs?

The size of the physiological VD and the level at which arterial PCO2 is regulated Signup and view all the answers

What is the relationship between work rate and the distribution of cardiac output to exercising muscle?

The distribution of cardiac output to exercising muscle depends on the work rate Signup and view all the answers

What is the end-capillary PO2 in the exercising muscles during maximal exercise?

Relatively uniform Signup and view all the answers

What happens to exercise endurance when exercise is performed above the AT?

It is reduced Signup and view all the answers

What is the primary factor that determines the degree of cardiovascular and ventilatory responses to exercise?

The work rate Signup and view all the answers

What is the primary role of the carotid bodies during exercise?

To monitor arterial [H+], providing sufficient ventilatory drive to minimize the decrease in arterial pH that occurs above the AT Signup and view all the answers

What happens to PaO2 during exercise?

It normally remains relatively constant Signup and view all the answers

What is the relationship between exercise above the AT and CO2 production?

Exercise above the AT increases CO2 production Signup and view all the answers

During exercise, what affects external respiration?

The magnitude of cellular respiration Signup and view all the answers

What happens to AT when cardiovascular transport of O2 is impaired?

AT is reduced Signup and view all the answers

What are the powerful ventilatory stimuli during exercise above the AT?

CO2 and H+ production Signup and view all the answers

What alters the gas exchange kinetics during exercise above the AT?

Increased CO2 and H+ production Signup and view all the answers

What enables the muscle end-capillary PO2 to be sufficiently high in all muscle capillary beds during maximal exercise?

The relative uniformity of the regional Q ̇ O2-Q ̇ m relationship Signup and view all the answers

What determines exercise ventilation?

The changing rate of CO2 delivery to the lungs Signup and view all the answers

What provides sufficient ventilatory drive to minimize the decrease in arterial pH that occurs above the AT?

The carotid bodies monitoring arterial [H+] Signup and view all the answers

What happens to PaO2 during exercise?

PaO2 normally remains relatively constant Signup and view all the answers

What depends on the work rate during exercise?

Distribution of the cardiac output to exercising muscle Signup and view all the answers

What reduces exercise endurance?

Altered gas exchange kinetics Signup and view all the answers

What is the main influence on the cardiovascular and ventilatory responses to exercise?

The degree to which the work rate is above an individual's AT Signup and view all the answers

What is impaired when the cardiovascular transport of O2 is impaired?

AT Signup and view all the answers

Gas Exchange and Exercise

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Questions and Answers

During exercise, what has a major influence on the cardiovascular and ventilatory responses to exercise?

What happens to AT when the cardiovascular transport of O2 is impaired during exercise?

What are the two powerful ventilatory stimuli produced during exercise above the AT?

What is the average percentage of O2 that can be extracted from muscle blood flow during maximal exercise?

What determines exercise ventilation besides the changing rate of CO2 delivery to the lungs?

What is the relationship between work rate and the distribution of cardiac output to exercising muscle?

What is the end-capillary PO2 in the exercising muscles during maximal exercise?

What happens to exercise endurance when exercise is performed above the AT?

What is the primary factor that determines the degree of cardiovascular and ventilatory responses to exercise?

What is the primary role of the carotid bodies during exercise?

What happens to PaO2 during exercise?

What is the relationship between exercise above the AT and CO2 production?

During exercise, what has a major influence on the cardiovascular and ventilatory responses to exercise?

What happens to AT when the cardiovascular transport of O2 is impaired during exercise?

What are the two powerful ventilatory stimuli produced during exercise above the AT?

What is the average percentage of O2 that can be extracted from muscle blood flow during maximal exercise?

What determines exercise ventilation besides the changing rate of CO2 delivery to the lungs?

What is the relationship between work rate and the distribution of cardiac output to exercising muscle?

What is the end-capillary PO2 in the exercising muscles during maximal exercise?

What happens to exercise endurance when exercise is performed above the AT?

What is the primary factor that determines the degree of cardiovascular and ventilatory responses to exercise?

What is the primary role of the carotid bodies during exercise?

What happens to PaO2 during exercise?

What is the relationship between exercise above the AT and CO2 production?

During exercise, what affects external respiration?

What happens to AT when cardiovascular transport of O2 is impaired?

What are the powerful ventilatory stimuli during exercise above the AT?

What alters the gas exchange kinetics during exercise above the AT?

What enables the muscle end-capillary PO2 to be sufficiently high in all muscle capillary beds during maximal exercise?

What determines exercise ventilation?

What provides sufficient ventilatory drive to minimize the decrease in arterial pH that occurs above the AT?

What happens to PaO2 during exercise?

What depends on the work rate during exercise?

What reduces exercise endurance?

What is the main influence on the cardiovascular and ventilatory responses to exercise?

What is impaired when the cardiovascular transport of O2 is impaired?

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