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When a neurone is stimulated an action potential is generated by a change in ion concentrations across the cell membrane. The resting membrane potential (the potential of charge across the membrane when t...

Homeostasis- is the principle by which the body maintains a constant internal environment in order to provide optimal conditions for the cells and enzymes to function. Water is taken in via drinking and a...

Water moves into the plant stem from the soil, and up to the leaves via the xylem. Water is taken up by the hairs on the root of the plant down the water potential gradient via osmosis, following the acti...

Beta cells have vesicles containing insulin inside them (1). (2) High glucose levels cause glucose uptake via glucose channels into the beta cell and glucose is metabolised into ATP (3) inside the cell, w...

DNA replication occurs in the nucleus of the cell inside what are known as replication bubbles. The two DNA strands are separated by an enzyme called Helicase and held apart by another enzyme called Topoi...