The process of breathing

During breathing, all the parts of the thorax change during inhilation and exhilation
DURING INHILATION
1. These movements increase the volume of the chest and cause a slight drop in pressure in the thorax
  1. Air then enters the lungs
2. External intercostal muscles CONTRACT pulling the ribs up
  1. Internal intercostals RELAX
3. Diaphragm CONTRACTS, pulling down into a flatter shape
DURING EXHILATION
1. External intercostal muscles RELAX pulling the ribs down and in
  1. Internal intercostals CONTRACT
2. Diaphragm RELAXES and returns to its normal domed shape
3. The chest volume decreases and the pressure in the thorax is raised slight above atmospheric pressure
  1. The difference in pressure forces air out of the lungs
There are two movements that bring about ventilation: the movement of the ribs and the diaphragm

Resumen del Recurso

	Creado por graciehoffs hace casi 12 años