Multiple Choice
Which endocrine gland is often called the “master gland” because it secretes hormones that regulate the activity of many other endocrine glands?
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16. The Endocrine System
The Hypothalamus and Pituitary Gland
Multiple Choice
In human physiology, what is the primary action of luteinizing hormone (LH)?
A
It stimulates milk production in the mammary glands.
B
It triggers ovulation and stimulates the formation of the corpus luteum in females, and stimulates testosterone production by Leydig cells in males.
C
It increases water reabsorption in the kidney collecting ducts.
D
It stimulates growth of ovarian follicles and promotes estrogen production by granulosa cells.
Verified step by step guidance1
Identify the hormone in question: luteinizing hormone (LH), which is a key hormone in the reproductive system.
Recall the primary functions of LH in females: it triggers ovulation, which is the release of an egg from the ovary, and it stimulates the formation of the corpus luteum, a structure that produces progesterone to support pregnancy.
Recall the primary functions of LH in males: it stimulates Leydig cells in the testes to produce testosterone, which is essential for male secondary sexual characteristics and spermatogenesis.
Compare these functions with the other options given: milk production is stimulated by prolactin, water reabsorption in kidneys is regulated by antidiuretic hormone (ADH), and growth of ovarian follicles with estrogen production is primarily stimulated by follicle-stimulating hormone (FSH).
Conclude that the primary action of LH is related to ovulation and corpus luteum formation in females, and testosterone production in males.
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