Cardiovascular system (CB)

Question 1

Three factors regulate stroke volume

Answer 1

• The degree of stretch
• The forcefulness of contraction
• The pressure required to eject blood from the ventricles.

Question 2

Three factors regulate stroke volume - The degree of stretch in the heart

Answer 2

The degree of stretch in the heart before it contracts. The greater the force of contraction during systole, a relationship known as the Frank–Starling law of the heart, the more forcefully it contracts (like stretching a rubber band).

Question 3

Three factors regulate stroke volume - The forcefulness of contraction

Answer 3

The forcefulness of contraction of individual ventricular muscle fibers. The heart can contract more or less forcefully when certain substances are present

Question 4

Three factors regulate stroke volume - The forcefulness of contraction - Stimulation of the sympathetic (ANS)

Answer 4

Stimulation of the sympathetic (ANS), increases the force of contraction of cardiac muscle.

Question 5

Three factors regulate stroke volume - The forcefulness of contraction - Inhibition of the sympathetic nervous system (ANS)

Answer 5

Inhibition of the sympathetic nervous system (ANS), decreases the force of contraction.

Question 6

Factors in Heart Rate Regulation

Answer 6

Age, gender, physical fitness, and body temperature also influence resting heart rate.