Question

How does the respiratory system provide oxygen to the body?

Answer 1

The deoxygenated blood from different parts of body comes to the right atrium (dilated )through superior and inferior venacava.These deoxygenated blood then goes to right ventricle (dilated) and tricuspid valve seperates right ventricle from right atrium.after that right ventricle got constricted ,this enables them to pump blood to pulmonary artery , which is the only artery carry deoxygenated blood, to the left and right lungs.

Blood from the pulmonary artery then goes to capillary that surrounds alveoli which carries inhaled oxygen.Gas exchange occurs in between alveoli and blood in capillaries. When oxygen diffuses into the red blood cells , carbon-dioxide diffuses back to alveoli from red blood cells, thus blood become oxygenated. These oxygenated blood pump to left atrium through pulmonary veins , which is the only vein that carry oxygenated blood.when atrium become constricted blood passes to left ventricle and bicuspid valve separates these chambers.during left ventricle constrict , blood pump forcefully to aorta and aorta gives oxygenated blood to different parts of body.

Note. During the atrium get constricted, the ventricle become dilated so that blood can easily pump from atrium to ventricle and in both sides it takes place at the same time.that is, both atrium and both ventricle