Answer :
Answer:
Oxygen molecules in the tissues of the lung diffuse into the blood because the concentration of oxygen in the lung's tissues is more than the concentration of oxygen in the blood.
Explanation:
Diffusion is the movement of molecules from the region of higher concentration of the molecule to the region of lower concentration of the same molecule. Molecules in diffusion move downward the concentration gradient created by difference in concentration between two regions until an equilibrium (equal concentration in the two regions) is established.
Oxygen molecules diffuse into the tissues of the lung when an organism breathes-in during the process of breathing. The molecules in the now oxygen-rich tissues eventually start diffusing into the blood in the lung because the blood passing through the lung is always de-oxygenated or has lower oxygen concentration compared to the tissues of the lung.
Oxygenated blood moves into the heart, pumps round the body by the heart, gets depleted of oxygen and eventually find its way back to the lung where the process is repeated.
Diffusion of oxygen from the tissues of the lung into the blood will keep happening as long as oxygen keeps getting dissolved into the lung's tissues and an equilibrium is yet to be established between the tissues and the blood.
Diffusion is the movement of any molecule from high to low concentration. Oxygen moves from the tissue towards the blood because of low concentration.
What is diffusion?
Diffusion is the process of the movement of the molecules from the region of high concentration towards the area having a low concentration of the molecule. It is the movement down the concentration gradient.
During the process of breathing, the oxygen diffuses into the tissues of the low concentration area and thus the tissues become rich and high in oxygen. Now, the low concentration of oxygen in blood reverses the process and the movement is seen towards the blood.
The process of the diffusion of the oxygenated and deoxygenated blood keeps repeating so that the dissolved oxygen is provided to the organs and the tissues to keep working.
Therefore, the oxygen from tissues goes to the blood so that the equilibrium is maintained.
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