Ventilation
Inhaled air enters through the nose and mouth and reaches the lungs. Oxygen enters the lungs and reaches the millions of alveoli .
Diffusion
Here the alveoli walls are only a cell thick which allows an easy and efficient exchange of the gases O2 and CO2 between the alveoli and the blood capillaries surrounding them. Inhaled oxygen from the alveoli moves to the blood capillaries and carbon dioxide waste moves from the capilaries to the alveoli through a reverse process out of the lungs, back up the trachea and larynx, and into the environment through the nose and mouth.
Perfusion
Cardiovascular system pumps blood through the lungs. The delivery of oxygen depends not only on the lungs but also the ability of blood to transport oxygen and circulation to transport blood to the muscle.
Inhaled air enters through the nose and mouth and reaches the lungs. Oxygen enters the lungs and reaches the millions of alveoli .
Diffusion
Here the alveoli walls are only a cell thick which allows an easy and efficient exchange of the gases O2 and CO2 between the alveoli and the blood capillaries surrounding them. Inhaled oxygen from the alveoli moves to the blood capillaries and carbon dioxide waste moves from the capilaries to the alveoli through a reverse process out of the lungs, back up the trachea and larynx, and into the environment through the nose and mouth.
Perfusion
Cardiovascular system pumps blood through the lungs. The delivery of oxygen depends not only on the lungs but also the ability of blood to transport oxygen and circulation to transport blood to the muscle.