Respiration is the process of breaking down glucose to produce energy, which happens in every living cell. Aerobic respiration is respiration using energy. The equation for aerobic respiration is Glucose + Oxygen --> Carbon Dioxide + Water. It is the most efficient way of releasing energy.
The circulatory system carries glucose, oxygen and amino acids through the body in the blood. The glucose needed for respiration comes from breaking down of food in the digestive system and the oxygen needed for respiration comes from breathing in air into the lungs.
The smallest blood vessels are called capillaries. All cells have capillaries nearby to supply them with glucose and oxygen and take away waste Carbon Dioxide.
These substances move between the cells and the capillaries by the process of diffusion.
Diffusion is the movement of particles from an area of high concentration to an area of low concentration.
When cells respire, they use up glucose and oxygen, so the concentration level of these substances inside the cells are low. The concentration of these substances is higher so they diffuse into the cell from the capillaries.
When cells respire, they produce carbon dioxide so the concentration of carbon dioxide inside the…