Which of the following statements regarding Ca2+ homeostasis is TRUE?
A. Parathyroid hormone directly stimulates Ca2+ reabsorption by the kidneys.
B. Parathyroid hormone directly stimulates Ca2+ absorption from the GI tract.
C. In the absence of parathyroid hormone, plasma Ca2+ levels would be abnormally low, resulting in the hyperpolarization of nerve and muscle membranes.
D. When plasma Ca2+ increases above normal, the secretion of parathyroid hormone increases.
E. Vitamin D decreases the renal tubular reabsorption of Ca2+.
A
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Which is the correct sequence of arteries that a drop of blood would flow through as it entered the kidney and moved toward a glomerulus?
A. Renal artery - interlobar artery - segmental artery - arcuate artery - interlobular artery B. Renal artery - segmental artery - interlobar artery - arcuate artery - interlobular artery C. Arcuate artery - interlobular artery - segmental artery - interlobar artery - renal artery D. Interlobar artery - segmental artery - interlobular artery - renal artery - arcuate artery E. Segmental artery - interlobar artery - interlobular artery - renal artery - arcuate artery
The __________ is the weight bearing portion of the vertebra.
Fill in the blank(s) with the appropriate word(s).
Which statement correctly describes the effect of aging on hair?
A. Terminal hairs become coarser. B. Hair follicle sebaceous glands increase in number, causing hair to be oilier. C. Hair on scalp becomes thicker. D. Loss of melanocytes in the skin has caused the hair to turn gray.
The heart lies in the ________ cavity.
A) superior mediastinal B) pleural C) dorsal D) pericardial