Exam 10: Circulatory Responses to Exercise

In most subjects,stroke volume continues to increase during incremental exercise up to approximately

The central command theory of cardiovascular control states that the initial signal to the cardiovascular system at the beginning of exercise comes from higher brain centers.

In order to meet the increased oxygen demands of muscle during exercise,two major adjustments in blood flow must be made:

At the onset of exercise,the initial drive to increase heart rate comes from higher brain centers.

The fact that an increase in end-diastolic ventricular volume increases the stroke volume of the heart is an illustration of the

The most important variable that determines resistance to blood flow is

The cardiovascular control center is located in the

The difference between systolic and diastolic blood pressure is called the

At any level of oxygen consumption,heart rate and blood pressure are lower during leg work when compared with arm work.

One reason the stroke volume increases during exercise is that skeletal muscle vasodilation decreases afterload.

The primary purpose of the cardiovascular system is to

The relationship between cardiac output and metabolic rate is

Which of the following is the correct order of events pertaining to contraction of the left ventricle?

Backflow of blood from the arteries into the ventricles is prevented by the

In a healthy heart,the time spent in systole is generally

An increase in cardiac output during exercise will decrease arterial blood pressure when peripheral resistance remains constant.

The relationship between oxygen uptake,cardiac output,and the arterial-venous oxygen difference is described mathematically by the

Electrical impulses are conducted between heart muscle cells by

The normal pacemaker of the heart is the

Which of the following statements about heart rate variability (HRV)is NOT true?