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1-Electrical excitability of cell membranes _____ when the extracellular concentration of calcium is low.
Group of answer choices
a-increases
b-decreases
2-Which statement about parathyroid hormone (PTH) is FALSE?
Group of answer choices
a-PTH increases the calcium concentration and decreases the phosphate concentration in blood by
various direct and indirect actions on bone, kidney, and intestine.
b-If PTH is lacking, the concentration of calcium in blood decreases dramatically, while the concentration
of phosphate increases.
c-PTH is the principal regulator of the extracellular calcium pool.
dHyperparathyroidism may result from insufficient production of active hormone or defects in
the responses of target tissues.
3-Calcium balance means that, on average, daily intake of calcium ___ daily loss of calcium in urine and
feces.
Group of answer choices
A-equals
B-is less than
C-is greater than
4-Severe ___ may produce generalized muscular contractions and convulsions.
Group of answer choices
A-hypercalcemia
B-hypocalcemia
5-What is the half-life of 1,25-dihydroxycholecalciferol (1,25(OH)2D3) in blood?
Group of answer choices
A-3 days
B-30 seconds
C-15 hours
D-5–10 minutes
6-Calcitonin is cleared from the blood primarily by the ___.
Group of answer choices
A-intestines
B-liver
C-kidney
D-lungs
7-List the three hormones collectively called calciotropic (calcitropic) hormones.
8 -Production of 1,25-dihydroxycholecalciferol (1,25(OH)2D3) involves multiple ___ feedback loops.
Group of answer choices
A-negative
B-positive
9 -Calcitonin remained undiscovered for many years because no obvious derangement in calcium
balance or other homeostatic function results from deficient or excessive production.
Group of answer choices
A-True
B-False
10 -Which statement about parathyroid glands in humans is TRUE?
Group of answer choices
A-Human typically have 10 parathyroid glands.
B-Chief cells have no known function.
C-Oxyphil cells predominate and are the source of parathyroid hormone (PTH).
D-Parathyroid glands adhere to the posterior surface of the thyroid gland or occasionally are embedded
within thyroid tissue.
11- The insulin-like growth factors (IGFs) circulate in blood ___.
Group of answer choices
A-free from binding proteins
B-tightly bound to IGF binding proteins (IGFBPs)
12 -Most,...
