Which of the following is an indirect effect of PTH?
Activating vitamin D
Increasing calcium reabsorption in the kidney
Increasing calcium absorption in the intestines
Increasing osteoclast activity
The Correct Answer is C
a) Activating vitamin D: This is a direct effect of PTH-PTH stimulates the activation of vitamin D (specifically, conversion to calcitriol) in the kidneys.
b) Increasing calcium reabsorption in the kidney: Also a direct effect-PTH acts on renal tubules to increase reabsorption of calcium.
c) Increasing calcium absorption in the intestines: The increased intestinal calcium absorption is an indirect effect because PTH stimulates the activation of vitamin D, and calcitriol then increases intestinal calcium absorption.
d) Increasing osteoclast activity: This is a direct effect-PTH binds to osteoblasts, which signal osteoclasts to break down bone and release calcium.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a) The anterior pituitary produces testosterone from cholesterol and releases it when releasing hormones arrive from the hypothalamus.
Testosterone is produced in the testes, not the anterior pituitary.
b) The hypothalamus produces ADH and oxytocin which are stored in the posterior pituitary.
ADH and oxytocin are synthesized in the hypothalamus and then transported to and stored in the posterior pituitary until needed.
c) The posterior pituitary contains autonomic centers that exert neural control over the adrenal glands.
The hypothalamus, not the posterior pituitary, regulates the adrenal medulla via neural signals.
d) The thalamus produces ADH and oxytocin which are stored in the anterior pituitary.
The thalamus is a relay station for sensory signals, not a hormone-producing structure.
Correct Answer is B,D,C,A
No explanation
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