In the diagram of the thyroid gland, Which letter indicates the follicles with colloids?
A
B
C
D
E
The Correct Answer is A
Colloid is a gel-like substance found within the follicles of the thyroid gland. It plays a critical role in the synthesis and storage of thyroid hormones.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
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.
Correct Answer is D
Explanation
a) Prolactin (PRL): Secreted by anterior pituitary to stimulate milk production.
b) Adrenocorticotropic hormone (ACTH): Stimulates adrenal cortex; anterior pituitary product.
c) Follicle-stimulating hormone (FSH): Produced by the anterior pituitary; regulates gonads.
d) Antidiuretic hormone (ADH): ADH is produced by the hypothalamus and stored/released by the posterior pituitary.
e) Luteinizing hormone (LH): Another anterior pituitary hormone involved in reproduction.
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