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Muscle cells are present in the stomach wall so that they can contract and move the food. This aids digestion and the action of enzymes

The movement of molecules from an area of high concentration to low concentration across a membrane using energy.

Aerobic respiration is a process that releases energy from a respiratory substrate (e.g. glucose) by fully oxidising it. Energy is released in the form of ATP; Carbon dioxide and Water are released as ...

The alveolar epithelium is very thin, just one cell layer thick. This means the diffustion distance is small, therefore diffusion of gases occurs rapidly.

Remember that diffusion is the n...