atmosphere
CO2 - Carbon dioxide.
exhaled
The carbon dioxide diffuses into the plasma portion of the blood and is carried to the heart. From there it is carried to the lungs where it is released when you exhale.
It is brought back to the heart to be pumped through the lungs to be exhaled.
As the blood passes though the pulmonary circulation, oxygen within the lungs binds with the hemoglobin and is carried from the lungs back to the heart and then from there on to the active tissues of the body.
from nose through airway in throat into lungs
OXYGEN
Gas is carried mostly by the plasma in the blood. The plasma contains dissolved gases such as oxygen and carbon dioxide, which are transported to different parts of the body. Oxygen is transported from the lungs to the tissues, while carbon dioxide is carried from the tissues back to the lungs for elimination.
Carbon dioxide is the molecule produced in the citric acid cycle as a byproduct of glucose oxidation. It is subsequently released into the bloodstream and carried to the lungs, where it is removed from the body through exhalation.
Carbon dioxide is carried in the blood mainly in the form of bicarbonate ions and some dissolved CO2. It diffuses from tissues into capillaries, where it is then carried to the lungs and expelled. Oxygen, on the other hand, binds to hemoglobin in red blood cells in the lungs and is carried to tissues where it is released.
Oxygen is transported through the bloodstream by binding to hemoglobin, a protein found in red blood cells. Hemoglobin carries oxygen from the lungs to the body's tissues and cells, where it is released to support cellular function and metabolism. Carbon dioxide, a waste product, is then carried back to the lungs to be exhaled.