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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 con...

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 ...

Cells under attack release histamine --> attracts macrophagesMacrophage engulfs pathogen into a phagocytic vacuole by phagocytosisMacrophage carries o...

Atherosclerosis is a build up of fat deposits in large and medium sized arteries. This causes narrowing of the blood vessels and can lead to cardiovascular disease. If a plaque ruptures it can cause occlu...

When an enzyme is inhibited it means that the specific substrate that normally fits in the enzymes active site can no longer bind due to the active site having changed shape or having been blocked.
C...