Which one of the following is the Master gland of the body?

RRB Nsg. Superintendent-20 July 2019 (Shift-3rd)

Applied Anatomy

Easy

Appeared in: RRB Nsg. Superintendent-20 July 2019 (Shift-3rd)

Explanation

The pituitary gland is called the "master gland" because it produces and secretes hormones that regulate the function of other major endocrine glands, including the thyroid, adrenal glands, and gonads.
It is located at the base of the brain and is controlled by the hypothalamus, forming a crucial link between the nervous and endocrine systems.
Hormones like Thyroid-Stimulating Hormone (TSH) and Adrenocorticotropic Hormone (ACTH) are direct examples of its control over other glands, making it the 'master' in the endocrine hierarchy.

Option A: The adrenal gland is a target gland, not the master gland. Its function is largely controlled by Adrenocorticotropic Hormone (ACTH) which is secreted by the pituitary gland.
Option B: The parathyroid glands' primary role is to regulate calcium and phosphate balance. Their secretion is mainly controlled by the level of calcium in the blood, not by the pituitary gland.
Option C: The thyroid gland is a target gland. Its production of metabolic hormones (T3 and T4) is directly stimulated by Thyroid-Stimulating Hormone (TSH) from the pituitary gland.

Visual 1: Diagram: The Endocrine System - Illustrating the location of the pituitary gland at the base of the brain and its target organs (thyroid, adrenals, gonads) to visually represent its 'master' role.
Visual 2: Flowchart: Hypothalamic-Pituitary-Target Gland Axis - Showing how the hypothalamus releases hormones to stimulate the pituitary, which in turn releases hormones to stimulate a target gland (e.g., thyroid), demonstrating the feedback loop.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Endocrine System: Pituitary Gland Function as background academic context rather than a clinical decision trigger.
Nurses frequently care for patients with pituitary disorders (e.g., pituitary tumors, diabetes insipidus, acromegaly). Monitoring hormone levels, administering hormone replacement therapy, and assessing for signs of hormone excess or deficiency are key nursing responsibilities.
What if? If a patient has a tumor that destroys the anterior pituitary (hypopituitarism), the nurse would expect to see signs of hypothyroidism (from low TSH), adrenal insufficiency (from low ACTH), and reproductive issues (from low FSH/LH), as all these 'downstream' glands would lack stimulation.

How to Approach the Question

Identify the core concept in the question, which is the term 'Master gland'.
Recognize this as a factual recall question related to the endocrine system's hierarchy.
Mentally review the major endocrine glands and their control mechanisms. Recall that the hypothalamus controls the pituitary, and the pituitary, in turn, controls many other glands.
Evaluate the options provided: Adrenal, parathyroid, and thyroid are all important glands, but they are primarily 'target' glands that are regulated by other hormones.
Conclude that the pituitary gland is the only option that fits the description of a 'master' controller of other glands.

Concept Tested & Keywords

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