Mod 3 (Cardiovascular Physiology)

Question 1

What is average heart rate emitted by the SA node (intrinsic control) without any extrinsic influence?

Answer 1

About 100 bpm

Question 2

Why is there a delay at AV node during electrical depolarization of the heart?

Answer 2

To allow more ventricular filling

Question 3

True / False: With the onset of exercise, research demonstrates that stroke volume increases in direct proportion to exercise intensity through maximal intensity

Answer 3

False; stroke volume only increases until a plateaus at moderate intensity exercise

Question 4

Which law helps explains how blood flow to the muscles increases under exercising conditions?

Answer 4

Poiseuille’s Law; during exercise, blood vessels supplying the muscles undergo vasodilation (larger vessels = more blood flow)

Question 5

Which exercise format would trigger the the greatest increase or response in systolic pressure?

Answer 5

3x8 barbell bench requiring 90 s rest; greatest systolic pressure is typically resistance training w/ heavy weights