L29: Cardiovascular Response to Exercise

Oxygen is needed in the ETC for _______ ATP production.

aerobic

What is VO2 max?

maximal capacity for oxygen consumption during exercise

The relationship between oxygen consumption and exercise intensity is _______.

linear

Oxygen consumption may increase ___-fold during exercise.

10

_______ is governed by the ability of the cardiovascular system to deliver blood and oxygen to the working mucles and the ability of the tissues to extract oxygen from the blood.

exercise capacity

The Fick Equation

VO2 = CO * a-v O2 difference

What are the three factors affecting oxygen delivery?

1-cardiac output
2-a-v O2 difference
3-arterial oxygen content (CaO2)

______ is the blood pumped by the heart per minute.

cardiac output

______ is the ratio of arterial to venous oxygen concentration in blood.

a-v O2 difference

______ is dissolved oxygen + hemoglobin-bound oxygen.

arterial oxygen content (CaO2)

What are the two ways working muscles' demand for oxygen is met?

1-increased oxygen extraction at working muscle
2-Increased blood flow to the working muscle.

Oxygen extraction can increase ___-fold during exercise.

3

Decreasing the venous oxygen content will ______ the a-v O2 difference.

increase

true or false
The parasympathetic activity is dominant at rest.

true

______ is the volume of blood pumped per contraction.

stroke volume

______ is the volume of blood in the ventricle before contraction.

EDV

______ is the volume of blood in the ventricle after contraction.

ESV

SV ______ during exercise.

increases

increasing contractility = ______ ejection fraction = _____ ESV = _____ SV

increased
decreased
increased

The blood flow to the working muscle is increased by ... (4)

1-increasing blood pumped by the heart
2-shunting and redistributing the blood
3-metabolic vasodilation in working muscle
4-decrease in TPR

Flow to non-exercising muscle decreases with ______ exercise intensity.

increasing

Vasodilation in skeletal muscle _____ TPR.

decreases