PA RC PA8 Ch. 13 Spring 17 (1 x PA 8 Ch. File Edit View Insert Format Tools Add-

Question

PA RC PA8 Ch. 13 Spring 17 (1 x PA 8 Ch. File Edit View Insert Format Tools Add-ons Help All changes saved in Drive 13 Spring 17 () 100% Norm al text ? Arial 4. TOPIC: The Diaphragm controls Breathing The diaphragm is a skeletal muscle which is required for ventilation (breathing). Air movement is caused by changes in lung volume (size) and pressure in response to contraction and relaxation of the diaphragm. A. Discuss HOW contraction of the diaphragm causes air to move IN during inspiration. B. Discuss HOW relaxation of the diaphragm causes air to move OUT during expiration. *Be sure both answers include information about lung volume and pressure changes caused by the diaphragm

Explanation / Answer

For this answer you must know Boyle's law -

A. Diaphragm contraction cause chest to expand this increases chest cavity or volume of lung. As the volume of lung increases the pressure inside lung decreases (Boyle's law). When pressure inside lung becomes lower than atmospheric pressure then air from external environment flows into lung because air flows from high to lower pressure. This results in inspiration.

B. When Diaphragm relax then chest is pulled downward and chest cavity or lung volume decreases which results in increased pressure of gases inside lung (Boyle's law). When pressure if gases inside lung increase more than that of atmospheric pressure then air moves out of lung to atmosphere. This lead to expiration.

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