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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. The c...

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 oxygen...

Nephrons are units of the kidney which are specially adapted for filtration and reabsorption of substances in the blood. Each nephron is composed of different various parts which have specific roles. These p...

Antiobiotics kill bacteria but bacteria can become resistant to antibiotics. This happens through a process called natural selection. Within a group/population of bacteria they will all have small difference...