Question

During Inspiration, muscles of diaphragm
A) Contracts
B) Expands
C) No effect
D) Coiled like string

Answer 1

Respiration is the biochemical cycle where the cells of an organism get energy by combining oxygen and glucose, bringing about the arrival of carbon dioxide, water, and ATP (the currency of energy in cells). The way toward breathing (breath) is separated into two stages, inspiration (inhalation) and expiration (exhalation).

Complete answer:
The cycles of inspiration (breathing in) and expiration (breathing out) are crucial for providing oxygen to tissues and eliminating carbon dioxide from the body. The two lungs are the essential organs of the respiratory system. Other components of the respiratory system conduct air to the lungs, for example, the (windpipe) which branches into more smaller structures called bronchi.
The diaphragm, situated underneath the lungs, is the major muscle of the respiration process. It is a muscle that contracts rhythmically and continuously, and more often than not, involuntarily. The essential muscles of inspiration are the diaphragm, the upper and more lateral external intercostals, and the parasternal segment of the interior intercostal muscles. During inspiration, the diaphragm contracts and pulls descending while the muscles between the ribs contract and pull upward. This builds the size of the thoracic pit and diminishes the pressure inside. Thus, air surges in and fills the lungs.
At the point when the diaphragm is relaxed, air is breathed out by elastic recoil of the lung and the tissues lining the thoracic cavity related to the abdominal muscles, which go about as an antagonist, paired with the stomach's contraction.
Therefore, the correct answer is option ‘A’, i.e. Contracts

Note: The stomach is joined to the base of the sternum, the lower ports of the rib cage, and the spine. As the stomach contracts, it builds the length and width of the chest cavity and in this manner expands the lungs. The intercostal muscles help move the rib cage and thus helps with the breathing.