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Ch. 16 The Endocrine System
Marieb - Human Anatomy & Physiology 7th Edition
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook
All textbooksMarieb, Hoehn 7th EditionCh. 16 The Endocrine SystemProblem 21
Chapter 15, Problem 21

Name two endocrine glands (or regions) that are important in the stress response, and explain why they are important.

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Identify the two main endocrine glands involved in the stress response: the hypothalamus-pituitary-adrenal (HPA) axis and the adrenal medulla.
Explain the role of the hypothalamus and pituitary gland: the hypothalamus releases corticotropin-releasing hormone (CRH), which stimulates the pituitary gland to secrete adrenocorticotropic hormone (ACTH).
Describe how ACTH acts on the adrenal cortex (part of the adrenal glands) to release cortisol, a hormone that helps the body manage stress by increasing glucose availability and suppressing non-essential functions.
Explain the role of the adrenal medulla in the stress response: it secretes catecholamines (epinephrine and norepinephrine), which prepare the body for 'fight or flight' by increasing heart rate, blood pressure, and energy supply.
Summarize why these glands are important: they coordinate hormonal responses that enable the body to adapt to and cope with stress through metabolic, cardiovascular, and immune system effects.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Hypothalamus-Pituitary-Adrenal (HPA) Axis

The HPA axis is a central stress response system involving the hypothalamus, pituitary gland, and adrenal glands. It regulates the release of cortisol, a hormone critical for managing stress by increasing energy availability and modulating immune responses.
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The Hypothalamus and Pituitary Gland Example 3

Adrenal Glands

The adrenal glands produce key stress hormones such as cortisol and adrenaline. Cortisol helps sustain prolonged stress responses, while adrenaline triggers immediate 'fight or flight' reactions, increasing heart rate and energy supply.
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Pituitary Gland

The pituitary gland acts as a master regulator by releasing adrenocorticotropic hormone (ACTH) in response to hypothalamic signals. ACTH stimulates the adrenal glands to produce cortisol, thus playing a crucial role in coordinating the body's hormonal stress response.
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