Multiple Choice
Which of the following statements is TRUE about the endocrine system?
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16. The Endocrine System
Introduction to the Endocrine System
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Which hormone is secreted by the pineal gland?
A
Oxytocin
B
Melatonin
C
Thyroxine (T4)
D
Cortisol
Verified step by step guidance1
Step 1: Understand the role of the pineal gland in the endocrine system. The pineal gland is a small endocrine gland located in the brain, primarily responsible for regulating circadian rhythms.
Step 2: Recall the hormones associated with the pineal gland. The main hormone secreted by the pineal gland is melatonin, which helps regulate sleep-wake cycles.
Step 3: Differentiate melatonin from other hormones listed. Oxytocin is secreted by the posterior pituitary gland, thyroxine (T4) is secreted by the thyroid gland, and cortisol is secreted by the adrenal cortex.
Step 4: Confirm that melatonin is the hormone secreted by the pineal gland by matching its function with the gland's role in regulating biological rhythms.
Step 5: Conclude that the correct answer is melatonin, as it is the hormone specifically secreted by the pineal gland.
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