Which one of the following brain areas regulates body temperature?

BHU NO - 2015

Applied Physiology

Easy

Appeared in: BHU NO - 2015

Explanation

The hypothalamus, located in the diencephalon, acts as the body's central thermostat, responsible for maintaining a stable internal body temperature.
It contains two main centers for temperature regulation: a 'heat loss center' in the anterior hypothalamus and a 'heat gain center' in the posterior hypothalamus.
When blood temperature rises, the hypothalamus triggers cooling mechanisms such as sweating (evaporation) and vasodilation (widening of skin blood vessels) to release heat.
Conversely, when blood temperature drops, it initiates warming mechanisms like shivering (involuntary muscle contractions) and vasoconstriction (narrowing of skin blood vessels) to generate and conserve heat.

Option A: The cerebrum is the largest part of the brain and is responsible for higher cognitive functions, including thought, language, and voluntary movement, not primary temperature regulation.
Option B: The cerebellum's main role is to coordinate voluntary muscle movements, maintain posture, and ensure balance. It does not regulate body temperature.
Option D: The hippocampus is a part of the limbic system and is essential for forming new memories and for learning. It has no direct role in thermoregulation.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function of Brain Areas - Thermoregulation as background academic context rather than a clinical decision trigger.
Damage to the hypothalamus from trauma, tumors, or surgery can cause severe and life-threatening disturbances in body temperature, such as central hyperthermia (hypothalamic fever) or hypothermia.
Nurses must be vigilant in monitoring the temperature of patients with known or suspected hypothalamic injury, as these patients may not exhibit a typical fever response to infection.
What if? If a patient has a high fever from an infection, the hypothalamus is still the regulator, but its 'set-point' has been temporarily raised by pyrogens. The nursing action is to administer antipyretics (as ordered) to help lower this set-point and manage symptoms, while the underlying infection is treated.

How to Approach the Question

First, identify the key concept in the question stem, which is 'regulates body temperature'.
This is a factual recall question requiring knowledge of the functions of different parts of the brain.
Systematically review the primary function of each option: Cerebrum (thought), Cerebellum (balance), Hypothalamus (homeostasis), Hippocampus (memory).
Match the function of 'thermoregulation' with the correct brain structure.
The hypothalamus is known as the body's thermostat, making it the correct choice.
Eliminate the other options based on their distinct primary roles in cognition, motor control, and memory.

Concept Tested & Keywords

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