40. Circulatory System
Circulatory and Respiratory Anatomy
1:24 minutes
Problem 8b
Textbook Question
Textbook QuestionThe diaphragm is a large sheet of muscle that helps move air in and out of your lungs. Breathing is automatically controlled by the brain, but you can choose to hold your breath or breathe deeper. What kind of muscle do you suppose makes up the diaphragm? (Explain your answer.)
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