Final answer:
The hormone secreted from the anterior pituitary when corticotropin-releasing hormone is released is adrenocorticotropic hormone (ACTH). The correct answer is d. ACTH.
Step-by-step explanation:
When the hypothalamus releases corticotropin-releasing hormone (CRH), it stimulates the anterior pituitary to secrete the adrenocorticotropic hormone (ACTH). ACTH then travels through the bloodstream to the adrenal cortex, where it prompts the release of various corticosteroid hormones, including cortisol, glucocorticoids, and mineralocorticoids like aldosterone.
However, when answering the specific question of what is released from the anterior pituitary in response to CRH, the correct option is d. ACTH. Furthermore, ACTH is synthesised from a precursor molecule known as pro-opiomelanocortin (POMC), which also gives rise to other biologically active molecules such as melanocyte-stimulating hormone and endorphins. It's important to differentiate between the anterior pituitary hormones and those secreted by other glands in response to these pituitary hormones, such as the adrenal cortex or medulla.