Gas exchange of oxygen and carbon dioxide takes place in the alveoli<span>. Oxygen from the inhaled air diffuses through the walls of the </span>alveoli<span> and adjacent capillaries into the red blood cells. The oxygen is then carried by the blood to the body tissues.</span>
Mostly by respond to stimuli. so its like it reacts to environment and do different actions
Rapid descent is imperative as the condition can<span> be fatal.</span>
1) type of cell in which the tissue is made of
2) shape
3) number of layers of cells
