Saymefit
The respiratory system consists of nose, phyanax, epiglottis, lungs, bronchi and trachea also the ribcage that protects the lungs, the diaphragm and intercostal muscles which pumps out the air in and out your chest and nervous connection to the brains which activates and control the muscles.

Visit here:
DISORDERS OF RESPIRATORY SYSTEM - SAYMEFIT
載入新的回覆