Question

During inspiration, the diaphragm
A) Expands
B) Shows no change
C) Contracts and flattens
D) Relaxed to become dome shaped

Answer 1

Hint: Inspiration is a breathing stage. The diaphragm is located below the lungs. It is the most important muscle involved in breathing in the respiration process.

Complete answer:
Breathing has two stages. In inspiration atmospheric air is stayed in and in expiration, the air is released out. When the pressure in the lungs( intrapulmonary pressure) is less than the atmospheric pressure, then inspiration takes place. And when intra pulmonary pressure is higher than the atmospheric pressure, expiration occurs.
In inhalation, the diaphragm contracts and flattens, and the chest cavity becomes enlarged. This contraction makes a vacuum. That pulls air into the lungs. In exhalation, the diaphragm relaxes and returns to its previous dome like shape. Then the air is forced out from the lungs.
A) So from the above paragraph, we can see Expands is wrong the wrong answer.
B) Shows no change - We can see this is also the wrong answer.
C) Contracts and flattens – yes, it is the correct option.
D) Relaxed to become dome-shaped, It is also an incorrect answer. Because it happens in the Expiration process.

Note: We all have the ability to increase the strength of expiration and inspiration with the help of additional muscle in the abdomen. Generally, a healthy fit human can breathe 12-16 times per minute.
Another important point is, the rhythm of the respiratory is maintained by the respiratory center in the medulla region of the brain.