A single lobe of a kidney is comprised of __________.
A. two calyces and a renal pelvis
B. one pyramid and the overlying cortex
C. one major calyx and all of its minor calyces
D. a renal medulla and two renal columns
E. one collecting duct and all nephrons that drain into it
B. one pyramid and the overlying cortex
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The principal means of increasing heat production in response to a cold environment is
A. wearing warm clothing. B. increasing food intake to elevate the metabolic rate. C. vasoconstriction of blood vessels in the skin. D. shivering thermogenesis and increased voluntary activity. E. vasodilation of blood vessels in skin.
Hypophysiotropic hormones
a. control the release of oxytocin and vasopressin from the posterior pituitary b. travel via neuron axons from the hypothalamus to the anterior pituitary c. are carried in the hypothalamo-hypophyseal portal system d. are released upon positive-feedback stimulation via anterior pituitary tropic hormones e. always act to stimulate the release of anterior pituitary hormones
Red blood cells (RBC's) have a prototypical cell structure with a nucleus and cell organelles.
a. true b. false
The only time during the cardiac cycle that the AV valves are open is systole.
Answer the following statement true (T) or false (F)