ACSM-EP Cardiovascular Physiology 4

Question 1

Which baroreceptors are the PRIMARY sensors for detecting acute changes in arterial blood pressure?

Accepted Answer

Stretch receptors in the carotid sinus and aortic arch

Answer

High-pressure baroreceptors located in the carotid sinus and aortic arch detect arterial wall stretch and provide rapid reflex feedback to regulate blood pressure.

Question 2

What physiological mechanism explains why heart rate does not increase linearly with cardiac output during very high-intensity exercise?

Accepted Answer

Stroke volume plateaus and cardiac output becomes heart-rate dependent

Answer

At higher exercise intensities, stroke volume plateaus (limited filling time) and further increases in cardiac output rely primarily on increasing heart rate.

Question 3

Which Fick equation component is most responsible for the higher VO₂max observed in elite endurance athletes compared to sedentary individuals?

Accepted Answer

Greater maximal cardiac output (Q̇max)

Answer

Elite endurance athletes primarily achieve higher VO₂max through substantially greater maximal cardiac output, facilitated by larger stroke volumes from cardiac hypertrophy and increased plasma volume.

Question 4

A client exhibits a blunted heart rate response to increasing exercise intensity. Which condition is MOST likely responsible?

Accepted Answer

Chronotropic incompetence

Answer

Chronotropic incompetence is defined as an inability to appropriately increase heart rate in response to increasing metabolic demand, often seen in heart failure or following cardiac surgery.

Question 5

During recovery from maximal exercise, which cardiovascular variable returns to resting values MOST rapidly?

Accepted Answer

Heart rate

Answer

Heart rate declines rapidly post-exercise (within 1–2 minutes) due to rapid vagal reactivation, while stroke volume, blood pressure, and plasma volume take longer to normalize.

ACSM Practice Test

ACSM Practice Test

ACSM-EP Cardiovascular Physiology 4