briannaroberson16
08.01.2020 •
Biology
When the diaphragm contracts, a. it lifts the rib cage b. it flattens out c. it flattens out and d. it rises in the thoracic cavity e. it rises in the thoracic cavity
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Ответ:
It flattens out
Explanation:
The diaphragm is a dome-shaped think skeletal muscle present in the thoracic cavity which separates the chest cavity from the abdomen.
Diaphragm along with intercostal muscles regulates the mechanism of breathing. When the diaphragm contracts, the muscle fattens which causes the rib cage to expand thus increase the volume for inspiration while when it relaxes, it uplifts the rib cage and causes exhalation.
Thus, it flattens out is the correct answer.
Ответ: