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Question
The primary muscle of inspiration which forms the floor of the thoracic cavity is ______.
The primary muscle of inspiration which forms the floor of the thoracic cavity is ______.
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Solution
The correct option is D Diaphragm
The diaphragm is a dome-shaped muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax, and results in inspiration. When this muscle relaxes, the thoracic volume returns to normal, causing expiration.
Diaphragm
The diaphragm is a dome-shaped muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax, and results in inspiration. When this muscle relaxes, the thoracic volume returns to normal, causing expiration.
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