Term for a deficiency of white blood cells.

The sino-atrial node is the primary “pacemaker” of heart rhythm.

A hormone secreted by the adrenal gland in response to stimulation from the kidney.

A chronotropic factor will cause the heart to change the force of contractions.

The blood vessel that has more muscle than elastic tissue in its walls to be able to constrict is the/a

The statements concerning factors that stimulate formation of blood cells are all true except

The leukocytes have differing roles in defense of the body: the cell that has the greatest role in control of parasitic infections or phagocytizing antigen-antibody complexes is the

The statements concerning cells of the specific (adaptive) immune system are all true except

Under normal circumstances, the number of oxygen molecules leaving each hemoglobin to get to tissue cells is

The roles of the large and small lymphocytes are all true except