Capillary beds need to be open of shut depending on where bl

Capillary beds need to be open of shut depending on where blood is needed in the body. Capillary beds have pre capillary sphincters to allow regulation of blood flow into and out of the bed. a. hierarchy of organization b. complementarily of structure and function c. enzyme activity. d. homeostasis e. all of these are correct

Solution

(a)hierarchy of organisation.

This is because the blood should be flowing from heart,to blood vessels,then capillaries this is the organised path of blood flow.Only in the capillaries the exchange of gases takes place through diffusion(mostly).Thus the given sentence best describes to hierarchy with respect of anatomy and physiology.