The wall of the left ventricle is thicker than the wall of the right ventricle, which allows the
a. left ventricle to pump much more blood than the right ventricle
b. right ventricle to hold more blood than the left ventricle
c. left ventricle to pump blood into a higher-resistance, higher-pressure system
d. right ventricle to create higher tension within its walls
e. left ventricle to pump oxygenated blood,
C
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All of the following conditions change peripheral resistance by affecting blood viscosity except
A) sickle-cell anemia. B) increase in erythropoietin. C) polycythemia. D) atherosclerosis. E) pernicious anemia.
A(n) ________ is a substance that consists entirely of atoms with the same atomic number.
Fill in the blank(s) with the appropriate word(s).
Antidiuretic hormone (ADH) acts upon the
A. descending loop of Henle. B. distal convoluted tubule. C. glomerulus. D. collecting duct.
The ion that plays a key role in initiating electrical signals in neurons is
A) Ca2+. B) Cl-. C) K+. D) Na+.