Which hormones of the anterior pituitary are collectively referred to as tropic hormones?

Rationale

TSH, FSH, ACTH, and LH are collectively referred to as tropic hormones.

Tropic hormones are those that stimulate other endocrine glands to release hormones, and the anterior pituitary produces several of these, including TSH (Thyroid Stimulating Hormone), FSH (Follicle Stimulating Hormone), ACTH (Adrenocorticotropic Hormone), and LH (Luteinizing Hormone).

A (ACTH, LH, GH, and TSH) YOUR ANSWER

While this option includes several hormones produced by the anterior pituitary, GH (Growth Hormone) is not a tropic hormone; it directly stimulates growth in tissues rather than acting on another gland.

B (Estrogen, ACTH, LH, and FSH) YOUR ANSWER

This choice incorrectly includes estrogen, which is not produced by the anterior pituitary but rather by the ovaries. Additionally, while ACTH, LH, and FSH are tropic hormones, the presence of estrogen makes this option incorrect.

C (TSH, FSH, ACTH, and LH) CORRECT

This option correctly identifies all four hormones that are considered tropic hormones. TSH stimulates the thyroid gland, FSH and LH stimulate the gonads, and ACTH stimulates the adrenal cortex, fulfilling the definition of tropic hormones.

D (TSH, LH, vasopressin, and FSH) YOUR ANSWER

This option includes vasopressin (also known as antidiuretic hormone), which is produced by the posterior pituitary, not the anterior. Therefore, this option cannot be correct as it confuses the hormones' origins.

Conclusion

The anterior pituitary produces several hormones, but only TSH, FSH, ACTH, and LH serve as tropic hormones, regulating other endocrine glands’ functions. Understanding the classification of these hormones is essential for grasping how the endocrine system maintains homeostasis through hormone signaling.

Which hormones of the anterior pituitary are collectively referred to as tropic hormones?

TSH, FSH, ACTH, and LH are collectively referred to as tropic hormones.

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