Question

The muscular movement of ........... helps in respiration.

• A. Ribs
• B. Diaphragm
• C. Lungs
• D. All of the above

Answer 1

Answer: (B)

Diaphragm

The diaphragm is the main muscle and does 99% of the work of breathing in a healthy, normal individual. It is located at the bottom of the rib cage. When it contracts, it creates a negative pressure in the upper chest cavity, which expands the lungs, drawing air in. When the diaphragm relaxes, exhalation occurs. Thus, the correct answer is option B.