What makes a cell responsive to a particular hormone?
The chemical properties of the hormone
The presence of a receptor for that particular hormone
The location of the gland that secretes the hormone
The location of the target cells in the body
The site where the hormone is secreted
The Correct Answer is B
A. The chemical properties of the hormone:
Chemical properties determine solubility and transport but do not alone determine cellular response.
B. The presence of a receptor for that particular hormone:
A hormone exerts its effects only on cells that express specific receptors for that hormone.
C. The location of the gland that secretes the hormone:
Hormones are typically secreted into the bloodstream and can act at distant sites; gland location does not determine target cell responsiveness.
D. The location of the target cells in the body:
Location doesn’t matter unless the cells have the appropriate receptors.
E. The site where the hormone is secreted:
The site of secretion is irrelevant to whether a target cell can respond; it must have the receptor.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Right common iliac artery:
Arises from the abdominal aorta; bifurcates into internal and external iliac arteries.
B. Right internal iliac artery:
Supplies pelvic organs; branches off the common iliac artery.
C. Left common iliac artery:
The left-side counterpart of the right common iliac.
D. Abdominal aorta:
Major artery running down the midline; bifurcates into the common iliac arteries around L4.
E. Right external iliac artery:
Continues into the femoral artery; runs along the pelvic brim.
F. Right femoral artery:
Located in the thigh, distal to the inguinal ligament; often seen in lower limb images.
Correct Answer is A
Explanation
A. It is an autonomic reflex mediated predominantly by parasympathetic nerve fibers: Erection is primarily driven by parasympathetic stimulation (S2–S4), which causes vasodilation of penile arteries and engorgement of erectile tissue.
B. It is an autonomic reflex mediated predominantly by sympathetic nerve fibers: Sympathetic fibers are involved in ejaculation and detumescence, not erection initiation.
C. It is a somatic reflex mediated predominantly by parasympathetic nerve fibers: Erection is not mediated by somatic (voluntary) control.
D. It is a somatic reflex mediated predominantly by sympathetic nerve fibers: Both components are incorrect—erection is not somatic and not sympathetic.
E. It is an exclusively voluntary action mediated by the cerebral cortex: Erection can be influenced by psychological stimuli, but the physiological mechanism is autonomic, not voluntary.
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