Question

Which of the following are not involved in the process of breathing in humans?

• A. nervous system
• B. diaphragm
• C. rib muscles
• D. blood pH receptors in the brain

Answer 1

The correct option is D

blood pH receptors in the brain

The correct answer is option (D)

Explanation of the correct option:

1. The pH receptors in the brain are not involved in the regulation of the process of breathing in humans.
2. The breathing in humans is mainly controlled by the diaphragm, intercostal muscles, and the nervous system.

Explanation of the incorrect options:

Option (A):

1. Breathing in humans is controlled by the nervous system.
2. It helps in the maintenance of homeostasis conditions in the body.

Option (B):

1. The diaphragm is present between the thoracic and the abdominal cavity.
2. During inspiration, the diaphragm contracts which leads to an increase in the thoracic cavity volume.
3. During expiration, the diaphragm relaxes which leads to a decrease in the volume of the thoracic cavity.

Option (C):

1. Rib muscles are commonly known as intercostal muscles.
2. They provide assistance in exhalation and help in the movement of ribs while breathing.
   

Final answer: Blood pH receptors in the brainare not involved in the process of breathing in humans.