Which gland in the endocrine system is primarily responsible for regulating metabolism through the secretion… - RRB Nsg. Superintendent-2026 (Shift -1st)

RRB Nsg. Superintendent-2026 (Shift -1st)

Applied Anatomy

Easy

Appeared in: RRB Nsg. Superintendent-2026 (Shift -1st)

Explanation

The thyroid gland produces two key hormones: triiodothyronine (T3) and thyroxine (T4).
These hormones are the principal regulators of the body's basal metabolic rate (BMR), which is the rate at which the body consumes energy at rest.
They influence the metabolism of carbohydrates, proteins, and fats in almost all cells of the body, affecting everything from heart rate to body temperature.

Option A: The adrenal gland's primary role is to manage the body's response to stress through hormones like cortisol and adrenaline, and to regulate blood pressure and electrolyte balance via aldosterone. It does not primarily regulate the overall metabolic rate.
Option B: The pancreas is crucial for glucose metabolism, secreting insulin and glucagon to regulate blood sugar levels. However, this is a specific aspect of metabolism, not the regulation of the overall basal metabolic rate.
Option C: The pineal gland's main function is to secrete melatonin, a hormone that regulates the body's circadian rhythms, or the sleep-wake cycle. It has no direct role in regulating overall metabolism.

Visual 1: Diagram - An illustration of the endocrine system, highlighting the location of the thyroid, adrenal, pancreas, and pineal glands to provide anatomical context.
Visual 2: Table - A comparative chart detailing the major endocrine glands, the hormones they secrete, and their primary physiological functions.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Functions of Endocrine Glands and Hormones as background academic context rather than a clinical decision trigger.
Disorders of the thyroid gland directly impact metabolism. Hyperthyroidism (overactive thyroid) causes a high metabolic rate, leading to symptoms like weight loss, rapid heart rate, and anxiety. Hypothyroidism (underactive thyroid) causes a low metabolic rate, resulting in weight gain, fatigue, and cold intolerance.
Nurses frequently monitor patients for signs of thyroid dysfunction, especially after neck surgery or in those with autoimmune diseases. This involves assessing vital signs, weight changes, energy levels, and mood.
What if? If a patient presented with symptoms of heat intolerance, palpitations, and unexplained weight loss, the nurse should suspect hyperthyroidism. The priority would be to report these findings and prepare for diagnostic tests like TSH, T3, and T4 levels.

How to Approach the Question

Step 1: Identify the key function in the question stem, which is 'regulating metabolism'.
Step 2: Systematically review the primary function of each endocrine gland listed in the options.
Step 3: Recall that the adrenal glands manage stress and electrolytes, the pancreas manages blood sugar, and the pineal gland manages sleep.
Step 4: Connect the function of 'regulating metabolism' to the thyroid gland and its hormones (T3 and T4).
Step 5: Conclude that the thyroid gland is the gland primarily responsible for this function, making it the correct choice.

Concept Tested & Keywords

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