Which of the following are features of capillaries? a. They allow direct diffusion of nutrients. b. They allow transport by vesicles. c. They have large pores to allow transport. d. They rely on...

Which of the following are features of capillaries?

a. They allow direct diffusion of nutrients.

b. They allow transport by vesicles.

c. They have large pores to allow transport.

d. They rely on valves to allow transport.

How many cusps does the semilunar valve at the base of the aorta have?

a. Two

b. Three

c. Four

d. Six