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An antigen is a substance that is introduced to the body and stimulates an immune response and the production of antibodies. Antibodies are proteins produced by cells in the body in in repsonse to the pre...
The action potential in the pre-synaptic neurone causes calcium ion channels to open
This causes calcium ions to diffuse into the neurone, down its concentration gradient
Osmosis is the movement of water molecules from a high partial pressure (or concentration) to a low partial pressure (or concentration) down a pa...
Thermoregulation is an example of homeostasis - the process by which the body maintains an optimum state. The body must maintain a stable temperature because extreme lows and highs of temperature can affe...
A neurones role is to transmit electrical impulses rapidly around the organisms body so that the organism can respond to changes in both their external and internal environments. Their structure consists ...
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