Question
Which part of the brain is responsible for controlling the vomiting reflex?
| A. |
Apneustic center |
| B. | Pneumotaxic centre |
| C. | Area Postrema |
| D. |
Hypothalamus |
|
Correct Answer � C Explanation |
 |
Area postrema: The area postrema is a specialized region located in the medulla oblongata at the base of the fourth ventricle in the brainstem. It is commonly referred to as the “vomiting center” or the “chemoreceptor trigger zone” (CTZ). The area postrema is responsible for detecting and responding to toxic substances or signals of distress in the bloodstream.
When stimulated, it can initiate the reflex response of vomiting. It plays a crucial role in triggering the vomiting reflex in response to various stimuli, including ingested toxins, certain medications, and signals from other parts of the body.
Reasons for ruling out other options are-
Option A: Apneustic center: The apneustic center is a region located in the lower part of the pons in the brainstem. It plays a role in the control of respiration by regulating the depth and timing of breathing. It is not directly involved in the control of vomiting.
Option B: Pneumotaxic center: The pneumotaxic center, also located in the pons, is involved in the regulation of breathing by modulating the duration and rate of inspiration. It does not have a direct role in controlling vomiting.
Option D: Hypothalamus: The hypothalamus is a region located at the base of the brain, below the thalamus. It is involved in the regulation of various physiological processes, including hunger, thirst, body temperature, and hormone secretion.
While the hypothalamus has connections to various brain regions and plays a role in the control of autonomic functions, it is not the primary center responsible for controlling vomiting.
