PE- Venous Return Mechanisms (DONUGHUE)

Question 1

What is Starling’s law of the heat?

Answer 1

If venous increases, stroke volume increases

Question 2

What are the 5 venous return mechanisms?

Answer 2

Pocket valves- one way valves prevent back flow
Muscle pump- veins help squeeze blood back to heart
Respiratory pump- breathing deeper increases pressure in thorax and abdomen
Smooth muscle- contraction + relaxation
Gravity- blood from upper body is aided in its return by gravity

Question 3

What is EDV?

Answer 3

Volume of blood that’s in the heart before systole (contraction)

Question 4

How do good venous return mechanisms aid an athlete?

Answer 4

Increased EDV
Increased SV
Increased HR

Question 5

How does increased venous return help improve the quality of performance during aerobic exercise?

Answer 5

Stretches the atrial wall
Greater stretch of myocardium 
Increased SV
Increased cardiac output 
More oxygen or blood to working muscles