Human Phys 4.4

Question 1

Hydrostatic capillary pressure

Answer 1

Pushes fluid out of vessels

Question 2

Colloid osmotic pressure

Answer 2

Pulls fluid back into vessel

Question 3

How does pressures work in starling forces of a vessel?

Answer 3

Vessel has capillary pressure pushing fluid out and interstitial pressure pushing fluid in

Osmotic pressure pulling fluid in and interstitial osmotic pressure pulling fluid out

Question 4

Filtration of vessels

Answer 4

Based on pushing fluid out and pulling it in

Question 5

What does it mean if the filtration is positive?

Answer 5

Fluid moves from inside to outside (occurs in arteries)

Question 6

What does it mean when the filtration is negative?

Answer 6

Fluid moves from outside to inside (occurs in veins)

Question 7

How does vasodilation occur during exercise?

Answer 7

Working muscle releases metabolites which binds to smooth muscle cells

Smooth muscle cells hyperpolarize and block Ca2+ release which causes relaxation and vasodilation so muscles can get more blood flow

Question 8

What happens during exercise in the body?

Answer 8

Sympathetic nervous system takes over and vasoconstricts blood vessels by releasing NE which depolarizes cell and more Ca2+ flows in and causes contraction and vasoconstriction (no blood flow to muscles)

Question 9

Functional sympatholysis

Answer 9

The process of overriding the sympathetic nervous system and causing blood vessels to vasodilate and supply more blood to muscles