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A stimulus (for example a pin) stimulates the receptor which causes a nerve impulse in the sensory neuron. The impulse travels to a synapse in the spinal cord, where chemicals diffuse across the gap in th...

The rate of chemical reactions within the body.

Muataions within genes can be caused by several ways. 

Sometimes they can be spontaneous or other times they can be induced by environmental factors. These factors can include chemicals s...

A high grade in GCSE Biology requires you jumping through a few hoops. For certain questions, specific facts are required in the answer and certain structures are required for the answers. There isn't ...

Blood goes into the atria of the heart and the atria contract and force blood into the ventricles. The ventricles then contract and force the blood out of the heart.

There are valves in t...