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Receptors in the skin which are sensitive to changes in pain, pressure and temperature detect a change in one of these factors. This acts as the stimulus for the reflex response. This stimulus triggers an el...

An electrical impulse arrives at the synaptic knob in the pre-synaptic neuron. This causes the voltage-gated calcium ion channels to open and calcium ions will diffuse into the synaptic knob, down the concen...

When a substance that is found that could be potentially useful for treating a disease, it can be developed into a drug. The drug then needs to be tested to check for safety, efectiveness and dosage. The dru...

Prokaryotic and eukaryotic organisms have some similar structures: cells membranes (selectively permeable membranes surrounding cells and controlling the entry and exit of materials), cytoplasm (the living s...

Reflex arch is a neural pathway that controls a fast, involuntary reflex. The pathway is as follows: 1)Receptors detect a stimuli such as fire or a neddle pricking your finger. 2) Nerve impulses from the rec...