During inspiration, the diaphragm
Show Hint
Breathing refers to the periodically filling of the lung with atmospheric air and then emptying it.
- expands
- shows no change
- contracts and flattens
- relaxes to become dome-shaped
The Correct Option is C
Solution and Explanation
During inspiration, the diaphragm contracts and then flatten to increase the thoracic cavity volume.
- The increase in volume leads to a decrease in intra-alveolar pressure.
- Intra-alveolar pressure is a pressure lower than atmospheric pressure that creates a pressure gradient.
- Due to the gradient, the air from the atmosphere is forced inside the lungs through the nasal cavity.
Breathing refers to the periodically filling of the lung with atmospheric air and then emptying it. Breathing in is known as inhalation or inspiration while breathing out is known as exhalation or expiration. During inhalation, the diaphragm contracts by partial flattening and increases the thoracic cavity lengthwise.
So, the correct answer is 'Contracts and flattens'.
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Concepts Used:
Breathing and Exchange of Gases
A metabolic process, which is carried out by all living organisms including plants, animals, and humans for the production of energy and to stay alive is Respiration. Except for required anaerobes, every other organism from amoeba to humans needs oxygen for survival. And evolution has reported a number of systems that allows the exchange of gases in organisms.
There are two types of respiration such as;
- Aerobic respiration — to produce energy, it occurs in the presence of oxygen
- Anaerobic respiration — to produce energy, occurs in the absence of oxygen
Breathing can be simply derived as the process of inhaling oxygen gas from the atmosphere and exhaling the carbon dioxide gas back into the atmosphere is termed breathing and the process is commonly known as respiration.
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