Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Autocrine signals affect the same cells that secrete them.
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16. The Endocrine System
Introduction to the Endocrine System
Problem 3
Textbook Question
Adrenocorticotropic hormone (ACTH) stimulates the release of:
(a) Thyroid hormones by the hypothalamus
(b) Gonadotropins by the adrenal glands
(c) Growth hormones by the hypothalamus
(d) Steroid hormones by the adrenal glands
Verified step by step guidance1
Step 1: Understand the role of Adrenocorticotropic hormone (ACTH). ACTH is a hormone produced by the anterior pituitary gland that primarily targets the adrenal cortex.
Step 2: Recall the function of the adrenal cortex. The adrenal cortex is responsible for producing steroid hormones, such as cortisol, aldosterone, and androgens.
Step 3: Analyze each option in relation to ACTH's function: (a) Thyroid hormones are produced by the thyroid gland, not stimulated by ACTH or the hypothalamus; (b) Gonadotropins are hormones like LH and FSH produced by the anterior pituitary, not by the adrenal glands; (c) Growth hormone is secreted by the anterior pituitary, not the hypothalamus, and is not stimulated by ACTH; (d) Steroid hormones are produced by the adrenal glands and their release is stimulated by ACTH.
Step 4: Conclude that ACTH stimulates the release of steroid hormones by the adrenal glands, making option (d) the correct choice.
Step 5: Summarize that ACTH acts on the adrenal cortex to promote the synthesis and release of steroid hormones, which are crucial for stress response and metabolism regulation.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Adrenocorticotropic Hormone (ACTH)
ACTH is a hormone produced by the anterior pituitary gland that regulates the function of the adrenal cortex. It stimulates the adrenal glands to produce and release steroid hormones, particularly cortisol, which helps the body respond to stress.
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Adrenal Glands and Their Hormones
The adrenal glands are located above the kidneys and consist of the cortex and medulla. The adrenal cortex produces steroid hormones such as cortisol, aldosterone, and androgens, which regulate metabolism, immune response, and salt balance.
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Hormonal Regulation and Feedback
Hormones like ACTH are part of feedback loops involving the hypothalamus and pituitary gland. The hypothalamus releases CRH to stimulate ACTH release, which then prompts the adrenal glands to secrete steroid hormones, maintaining homeostasis through negative feedback.
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