Correct Answer: Correct answer is: (C) A hormone released by the adrenal glands in response to stress.
Exam Relevance: MCAT, USMLE, Physiology exams
Difficulty: Moderate
Concept notes: Cortisol is a steroid hormone produced by the adrenal glands in response to stress. It plays a crucial role in regulating metabolism and the body's response to stress.
Common Mistakes: Students often confuse cortisol with other hormones like adrenaline, which is also released in response to stress but from the adrenal medulla, not the adrenal cortex.
Explanations: Cortisol is synthesized and secreted by the adrenal cortex in response to stress signals, primarily from the hypothalamus and pituitary gland. This hormone helps the body manage stress by increasing blood sugar levels, suppressing the immune system, and aiding in metabolism. The adrenal glands are the primary source of cortisol, not the pituitary gland, liver, or gall bladder.
Option Analysis: - Option A: Incorrect. Cortisol is not released by the pituitary gland; it is released by the adrenal glands.
- Option B: Incorrect. Cortisol is not released in response to sunlight; it is released in response to stress.
- Option C: Correct. Cortisol is a hormone released by the adrenal glands in response to stress.
- Option D: Incorrect. Cortisol is not produced in the liver or stored in the gall bladder; it is produced by the adrenal glands.
Mnemonic: Adrenal glands, stress, cortisol: "Adrenal glands under stress, cortisol is the boss."
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