The hormone that causes the alveoli of the mammary glands to secrete milk is:
estrogen.
oxytocin.
prolactin.
estrogen.
The Correct Answer is C
A. estrogen: This hormone promotes the development of the duct system in the breasts but does not trigger milk secretion.
B. oxytocin: This hormone causes the ejection (let-down) of milk by contracting cells around the alveoli; it does not stimulate the actual production/secretion of milk into the alveoli.
C. prolactin: Produced by the anterior pituitary, prolactin is the primary hormone responsible for stimulating the mammary glands to synthesize and secrete milk.
D. estrogen: This hormone promotes the development of the duct system in the breasts but does not trigger milk secretion.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. two nerve fibers come in direct contact: In a chemical synapse, there is a physical gap called the synaptic cleft; the neurons do not touch.
B. impulses will pass in either direction: Chemical synapses are one-way streets because receptors are only located on the postsynaptic membrane.
C. an electrical spark will jump the gap: Nerve impulses are electrochemical, but they do not "spark" across the air/fluid gap like static electricity.
D. chemical transmitters are released: The arrival of an action potential triggers the release of neurotransmitters (like acetylcholine) to carry the signal across the cleft.
Correct Answer is D
Explanation
A. carbon: Carbon is the "backbone" of all organic molecules, found in both proteins and carbohydrates.
B. hydrogen: Hydrogen is present in all organic molecules, including both proteins and carbohydrates.
C. oxygen: Oxygen is a key component of both proteins and carbohydrates.
D. nitrogen: Proteins are made of amino acids, which contain an amino group (-NH2). While carbohydrates typically only contain C, H, and O, nitrogen is a defining element for proteins.
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