Question

Assertion: Humans have the ability to maintain and modify the rhythm of respiration.
Reason: It is done by the centre present in the cerebellum of the brain.

• A. Both the assertion and reason are true and the reason is the correct explanation of the assertion
• B. Both assertion and reason are true but the reason is not the correct explanation of the assertion
• C. The assertion is true but the reason is false
• D. Both the assertion and reason are false

Answer 1

The correct option is C The assertion is true but the reason is false

Humans have the ability to modify and maintain the rhythm of respiration to meet the demands of tissues in the body. It is done with the help of the neural system. The neural system is a complex part of living organisms like human beings that help in controlling and coordinating between various biological processes occurring inside the organism. Hence, the assertion is correct.
Neural System mainly consists of the brain, spinal cords, nerves, and sensory organs. The brain has several parts like the cerebrum (forebrain), midbrain, medulla oblongata (stem-like structure in hindbrain), pons (horseshoe-shaped structure in hindbrain connecting medulla with cerebellum), and cerebellum (dorsal projection in hindbrain). Both medulla and pons have regions responsible for the regulation of respiration. The medulla contains a respiratory rhythm centre that primarily controls respiratory rhythm while pons possesses a pneumotaxic centre that moderates the function of the respiratory rhythm centre. The cerebellum is not responsible for the regulation of respiratory rhythm. It is primarily responsible for controlling voluntary actions. Hence, the reason is incorrect.