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The relfex arc is an innate response designed to keep us safe (this means we do not consiously think about doing it). One of the most common examples for this question is a person touching a hot flame ...

Peristalsis describes the movement of food throughout the digestive system. Muscles in within the gut wall contract therefore pushing the bolous of food through the digestive system.

The movement of a substance from an area of high concentration to an area of lower concentration. One of the ways a substance can move in and out of a cell across the cell membrane. 

Breathing begins with inhalation. This starts with the contraction of the diaphragm, which flattens on contraction pulling the lungs down. The intercostal muscles contract to move the lungs up and out....

Blood is made of many components, one of them being red blood cells. These are responsible for carrying oxygen around the body. Haemoglobin is the protein molecule within red blood cells that binds to ...