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

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

Cardiac output can be calculated as _____.

_____ 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.

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