Which structures moves down as its muscles contract?
a. diaphragm b. pharynx c. ribs d. trachea
a. diaphragm b. pharynx c. ribs d. trachea
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Answer:
a. diaphragm
As you breathe in, your diaphragm contracts and flattens out. This allows it to move down, so your lungs have more room to grow larger as they fill up with air.