1.)
Inhaled air includes oxygen, which travels through the thin lining of the air sacs to reach the blood vessels. This is referred to as diffusion. The bloodstream then transports the oxygen in the blood throughout the body, reaching every cell. When oxygen enters the circulation, carbon dioxide leaves.
2.)
The word "glucose" comes from a Greek word that means "sweet." It's a type of sugar that originates from the foods you eat and is converted into energy by your body. Because it travels via your circulation to your cells, it's termed blood glucose or blood sugar. Insulin is a hormone that transfers glucose from the circulation to cells for storage and usage as fuel.
3.)
Breathing not only gives your body the oxygen it needs, but it also gets rid of trash like carbon dioxide. Your blood transports carbon dioxide to the capillaries that surround your alveoli to be expelled. Carbon dioxide flows from the alveoli to the lungs, where it is exhaled out of the body.
