During inspiration the diaphragm:
Correct answer: B. Contracts and goes downward
- A. Contracts and relax
- B. Contracts and goes downward
- C. Relax and rises
- D. Relax and goes downward
Explanation
During inhalation, the diaphragm, which is a dome-shaped muscle that separates the chest cavity from the abdominal cavity, contracts and flattens. This contraction causes the diaphragm to move downward, which increases the volume of the thoracic cavity. As the thoracic cavity expands, it creates a negative pressure within the lungs, and air is drawn into the lungs from the outside to equalize the pressure. This is how the process of inhalation occurs, and the diaphragm plays a vital role in this process by creating the necessary pressure difference.
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About Digestion
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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