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An unconsious action in response to a stimulus. These are very quick movements and have evolved to allow basic protection. For example, when you touch something hot, you automatically remove your hand bef...

A synapse is the area between two nerve cells, allowing electrical impulses to be passed between them. In order to cross the gap from one neuron to another, the impulse gets converted to neurotransmitter ...

Answer = 50% chance of developing cystic fibrosis 

Firstly, the whole point of a reflex is to create a QUICK reaction to a STIMULUS. So, the first stage of a reflex is SENSATION - i.e when you first touch the hot object the receptors in the skin will sens...

The first line of defence is the skin. This forms a physical barrier that prevents any microorganisms from getting into the body. Acid in the stomach, due to the low pH, is another defence the body has. T...