Body temperature is regulated by?

Appeared in: NHM UP Staff Nurse - 2017

Explanation

The hypothalamus, located in the brain, functions as the body's primary thermostat.
It maintains the body's core temperature at a constant set point, which is around 37°C (98.6°F).
The anterior hypothalamus controls heat loss mechanisms like sweating and vasodilation.
The posterior hypothalamus controls heat production and conservation mechanisms like shivering and vasoconstriction.

Option A: The medulla oblongata is primarily responsible for regulating vital autonomic functions such as breathing, heart rate, and blood pressure, not body temperature.
Option C: The pituitary gland is the 'master gland' of the endocrine system. It secretes hormones that regulate various bodily functions, but it does not directly regulate temperature. It can be influenced by the hypothalamus (e.g., TRH from hypothalamus stimulates TSH from pituitary), but it is not the primary regulator.
Option D: The cerebrum is the largest part of the brain and is involved in higher-order functions such as conscious thought, memory, personality, and voluntary muscle movements. It is not the primary center for autonomic functions like thermoregulation.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Physiology of thermoregulation as background academic context rather than a clinical decision trigger.
A fever (pyrexia) is not a failure of the hypothalamus, but rather a resetting of its set point to a higher temperature, usually in response to pyrogens released during an infection.
Damage to the hypothalamus, from a stroke, traumatic brain injury, or tumor, can severely impair thermoregulation, leading to conditions like hyperthermia or hypothermia.
Nurses monitor temperature closely as it is a key vital sign. An abnormal temperature can be the first sign of infection, inflammation, or neurological issues.

How to Approach the Question

First, identify the key concept in the question stem, which is the regulation of body temperature.
This is a factual recall question that requires knowledge of basic human physiology, specifically neuroanatomy and function.
Systematically review the function of each option provided.
Recall that the hypothalamus is often referred to as the body's 'thermostat'.
Eliminate the other options based on their primary functions: Medulla (vital functions like breathing/heart rate), Pituitary (hormones), and Cerebrum (higher thought/voluntary action).
Confirm that the hypothalamus is the best fit for the function described in the question.

Concept Tested & Keywords

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E6 Physiology Essentials Sembulingam 10e Part 2 p. 10-12

E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 9-11

Practise the full NHM UP Staff Nurse - 2017

Attempt every question from this paper in a timed mock, then review the full solution for each one.