nuclear division that produces daughter nuclei each having one-half as many chromosome sets as the parental nucleus; meiosis I is a reduction division

action in response to direct physical stimulation of a nerve

period after an action potential when it is more difficult or impossible for an action potential to be fired; caused by inactivation of sodium channels and activation of additional potassium channels of the membrane

continued speciation divergence between two related species due to low fitness of hybrids between them

individual’s ability to survive and reproduce relative to the rest of the population

absolute population size of a particular species relative to the population sizes of other species within the community

branch of the artery that enters the kidney

layer that encapsulates the kidneys

area of the kidney through which the interlobar arteries travel in the process of supplying blood to the renal lobes

area of the kidney through which the interlobar arteries travel in the process of supplying blood to the renal lobes

glomerulus and the Bowman's capsule together

connective tissue that supports the kidneys

region in the kidney where the calyces join the ureters

conical structure in the renal medulla

tubule of the nephron that arises from the glomerulus