RRB Nsg. Superintende…: Which hormone is most associated with the body's stress response?

RRB Nsg. Superintendent-2026 (Shift -2nd)

Applied Physiology

Easy

Appeared in: RRB Nsg. Superintendent-2026 (Shift -2nd)

Explanation

Cortisol is the body's primary glucocorticoid hormone, released from the adrenal cortex specifically to manage physiological and psychological stress.
The release of cortisol is triggered by the Hypothalamic-Pituitary-Adrenal (HPA) axis in response to a perceived threat or stressor.
Its main functions during stress are to increase blood glucose for immediate energy, suppress non-essential functions like the immune and digestive systems, and aid in fat and protein metabolism.
This cascade of effects is collectively known as the 'fight-or-flight' response, preparing the body to handle the stressful situation.

Option A: Melatonin's primary role is regulating the circadian rhythm (sleep-wake cycle), not managing the acute physiological stress response.
Option B: Serotonin is a neurotransmitter primarily involved in mood regulation, happiness, and well-being. While chronic stress can deplete serotonin, it is not the hormone released to initiate the stress response.
Option C: Insulin's function is to lower blood glucose. The stress response, driven by cortisol, aims to increase blood glucose for energy. Therefore, insulin's action is contrary to the immediate needs of the stress response.

Visual 1: Diagram - A flowchart illustrating the Hypothalamic-Pituitary-Adrenal (HPA) axis, showing the sequence from the hypothalamus releasing CRH, to the pituitary releasing ACTH, and finally the adrenal gland releasing cortisol.
Visual 2: Infographic - A comparison table showing the four hormones (Cortisol, Melatonin, Serotonin, Insulin), their source glands, primary functions, and what triggers their release.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Hormonal regulation of the physiological stress response as background academic context rather than a clinical decision trigger.
Understanding cortisol's role is crucial for nurses, as prolonged stress and high cortisol levels can lead to health problems like Cushing's syndrome, weight gain, hypertension, and impaired immune function.
Nurses monitor for signs of adrenal insufficiency (Addison's disease), where the body doesn't produce enough cortisol, leading to fatigue, muscle weakness, and low blood pressure. This can be a life-threatening condition.
What if? - If a patient is on long-term high-dose corticosteroid therapy (e.g., for autoimmune disease), their adrenal glands may stop producing their own cortisol. If the medication is stopped abruptly, the patient can go into an adrenal crisis, a medical emergency. This is why steroids must be tapered off slowly.

How to Approach the Question

First, identify the key concepts in the question: 'hormone' and 'stress response'.
The question asks which hormone is 'most associated' with stress, implying you need to identify the primary one.
Recall the major endocrine hormones and their primary functions.
Evaluate each option: Melatonin (sleep), Serotonin (mood), Insulin (lowers blood sugar), Cortisol (raises blood sugar, stress).
Based on this recall, Cortisol is clearly identified as the principal hormone that mediates the body's response to stress.
Confirm the choice by recognizing that the other hormones have different primary functions, even if they are indirectly affected by stress.

Concept Tested & Keywords

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Guyton & Hall Textbook of Medical Physiology 13e — Part 1 p. 654-657