3/9- Veins (Exam 2)

Question 1

What is the net filtration pressure (NFP)?

Answer 1

Overall force moving in and out of vessel

NFP = net hydrostatic pressure - net colloid pressure

Net colloid pressure is blood colloid osmotic pressure

Question 2

What happens if the net filtration pressure is positive or negative?

Answer 2

Positive number- water is leaving the vessel

Negative number- water is entering the vessel

Question 3

What are veins or venous circulation?

Answer 3

Where most of your blood is

Acts as blood reservoir

Thin walls that stretch

Blood in veins are under low pressure

Question 4

What does capacitance mean?

Answer 4

Stretchable

Question 5

What does capacitance vessels mean?

Answer 5

What veins are called because they’re stretchable

Question 6

What condition are blood reservoirs needed for?

Answer 6

Hemorrhage

Question 7

What is venoconstriction?

Answer 7

Veins constricting and push blood to arteries

Vasomotor center controls this by sending sympathetic signal to veins

Constricting smooth muscle of tunica media of veins

Question 8

What are 3 tricks employed to get blood back to heart?

Answer 8

1) one way valves- blood can’t flow backwards
2) venous constriction- anything that can constrict a vein (ex: moving)
3) pressure changes in the chest when breathing- pressure drops in chest when you take a breath and blood is drawn to that