Which of the following control breathing rate in humans?
Answer Details
The medulla oblongata controls the breathing rate in humans. Medulla oblongata is a part of the brainstem that is responsible for many involuntary functions including breathing. It is located at the base of the brain, just above the spinal cord.
The medulla oblongata contains special cells called respiratory centers, specifically the dorsal respiratory group (DRG) and the ventral respiratory group (VRG). These centers detect the levels of carbon dioxide (CO2) and oxygen (O2) in the blood.
When the carbon dioxide levels in the blood increase, the DRG signals the muscles of the diaphragm and the ribcage to contract. This causes inhalation, allowing fresh oxygen to enter the lungs and carbon dioxide to be exhaled. On the other hand, when the carbon dioxide levels decrease, the DRG signals the muscles to relax, resulting in exhalation.
The medulla oblongata also communicates with the hypothalamus and the thalamus, but their roles are not directly related to controlling the breathing rate. The hypothalamus regulates body temperature, hunger, thirst, and other functions, while the thalamus is involved in relaying sensory information to the cerebral cortex.
The cerebellum, although important for coordination and balance, does not control the breathing rate.
In summary, the medulla oblongata is responsible for controlling the breathing rate in humans by detecting the levels of carbon dioxide in the blood and signaling the muscles involved in breathing to adjust accordingly.