Multiple Choice
Which of the following best describes how an organism senses a disturbance in gas levels?
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10. Cell Signaling
Introduction to Cell Signaling
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Which of the following is true about the let-down reflex in mammals?
A
It is primarily controlled by the hormone insulin.
B
It is inhibited by the presence of prolactin.
C
It is triggered by the release of oxytocin from the posterior pituitary gland.
D
It causes milk production in the mammary glands.
Verified step by step guidance1
Understand the let-down reflex: The let-down reflex is a physiological process in mammals that facilitates the release of milk from the mammary glands during nursing. It is distinct from milk production, which is regulated by prolactin.
Identify the hormone involved: The let-down reflex is primarily controlled by oxytocin, a hormone released from the posterior pituitary gland. Oxytocin causes the contraction of myoepithelial cells surrounding the mammary alveoli, pushing milk into the ducts.
Clarify the role of prolactin: Prolactin is responsible for milk production, not the let-down reflex. It is not an inhibitory factor for the let-down reflex; rather, it complements oxytocin's role in lactation.
Eliminate incorrect options: Insulin is not involved in the let-down reflex, and the reflex does not directly cause milk production. These options can be ruled out based on the physiological roles of the hormones.
Conclude with the correct answer: The let-down reflex is triggered by the release of oxytocin from the posterior pituitary gland, which facilitates milk ejection from the mammary glands during nursing.
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