Contagious Diffusion is the rapid, widespread diffusion of a characteristic throughout the population. A few examples of Contagious Diffusion are: The widespread amount of people with AIDS in America. Hinduism spreading throughout the Indian subcontinent.

Expansion Diffusion is the spread of an idea through a population where the amount of those influenced grows continuously larger. There are three sub-types of Expansion diffusion: Stimulus, Hierarchical, and Contagious.

Expansion diffusion. The spread of an idea through a population in a way that the number of those influenced becomes continuously larger. Includes contagious, hierarchical, and stimulus diffusion.

Diffusion of oxygen and carbon dioxide gas occurs in the lungs. Diffusion of water, salts, and waste products occurs in the kidneys. Diffusion of calcium from food into cells occurs in the intestines. Molecules are not the only things that can diffuse.

Breathing. Take a deep breath and thank diffusion, because oxygen only gets into your bloodstream when the O2 molecules you breathe in diffuse into deoxygenated blood. Breathing in and out is a mechanical action, not diffusion, but the oxygen actually enters your bloodstream through diffusion.

From the alveoli, the oxygen from the air you breathe enters your blood in nearby blood vessels. This is a process called oxygen diffusion. Once your blood is oxygenated, it carries oxygen throughout your body. Another form of diffusion occurs when blood containing carbon dioxide travels back to your lungs.

The body needs a way to get oxygen in and carbon dioxide out, which is through diffusion. When blood returns to your lungs from the body, it has a lot of carbon dioxide and little oxygen. So, by the rule of diffusion, the carbon dioxide moves from the blood to the alveoli, where it can be exhaled through the lungs.

The difference in concentration is known as the concentration gradient. Diffusion is very important in the body for the movement of substances eg the movement of oxygen from the air into the blood and carbon dioxide out of the blood into the air in the lungs, or the movement of glucose from the blood to the cells.

Examples of diffusion in living organisms Oxygen and carbon dioxide, dissolved in water, are exchanged by diffusion in the lungs: oxygen moves down a concentration gradient from the air in the alveoli to the blood. carbon dioxide moves down a concentration gradient from the blood to the air in the alveoli.

surfaces where O2 diffuses into the blood and CO2 diffuses out of the blood. Each lung contains millions of these sacs. The small round alveoli allow for an amazingly large surface area for this gas exchange to take place. Therefore, the greater the surface area, the more gas exchange can occur.

Red blood cells: Red blood cells (RBCs, also called erythrocytes; say: ih-RITH-ruh-sytes) are shaped like slightly indented, flattened disks. RBCs contain hemoglobin (say: HEE-muh-glow-bin), a protein that carries oxygen.

Blood cells are made in the bone marrow. The bone marrow is the soft, spongy material in the center of the bones. It produces about 95% of the body’s blood cells.

The circulatory system delivers oxygen and nutrients to cells and takes away wastes. The heart pumps oxygenated and deoxygenated blood on different sides. The types of blood vessels include arteries, capillaries and veins.