Regulation of the Heart

Question 1

Intrinsic regulation

Answer 1

Results from normal functional characteristics, not neural or hormonal

Question 2

Preload

Answer 2

Amount of stretch of the ventricular walls

Question 3

How can you increase the heart’s stroke volume?

Answer 3

Fill it with more blood to increase the stretch of the ventricle

Question 4

Extrinsic regulation

Answer 4

Involves nerual (para and sym) and hormonal (Epi and norepi) control

Question 5

What does sympathetic stimulation cause?

Answer 5

Increase in intracellular calcium, faster depolarization and heart rate, and greater force of contraction

Question 6

What does parasympathetic stimulation cause?

Answer 6

Potassium to move out of the cell, hyperpolarization, and a slower heart rate