Multiple Choice
Which of the following is NOT an endocrine gland?
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16. The Endocrine System
Introduction to the Endocrine System
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Which hormone is primarily secreted by the pineal gland?
A
Thyroxine (T4)
B
Cortisol
C
Melatonin
D
Oxytocin
Verified step by step guidance1
Step 1: Understand the function of the pineal gland. The pineal gland is a small endocrine gland located in the brain that primarily regulates circadian rhythms and sleep-wake cycles.
Step 2: Identify the hormones listed in the problem and their primary sources: Thyroxine (T4) is secreted by the thyroid gland; Cortisol is secreted by the adrenal cortex; Oxytocin is secreted by the hypothalamus and released by the posterior pituitary.
Step 3: Recognize that Melatonin is the hormone produced and secreted by the pineal gland, which helps regulate sleep patterns.
Step 4: Confirm that among the options given, Melatonin is the hormone primarily secreted by the pineal gland.
Step 5: Conclude that the correct answer is Melatonin based on the gland-hormone relationships.
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