Peripheral resistance __________.

Velocity of blood is fastest in the _____ and slowest in the _____.

When two species contain identical or nearly identical molecules such as proteins, this suggests

_____ autoregulation in the systemic circuit causes vasodilation of arterioles and relaxation of precapillary sphincters in response to declining tissue oxygen and build-up of waste from active tissues.

Cardiac output can be calculated as _____.

Which of the following lymphoid organs cleanses the blood of aged red blood cells and platelets?

During the pacemaker potential phase of the action potential of a pacemaker (autorhythmic) cell, _____ channels are open and the cell membrane continuously depolarizes.

Blood flow to the skin __________.

Hemorrhage resulting in a large loss of blood volume causes __________.

Movement of individuals into or out of the population, called gene flow, impacts evolution of populations because