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-To start the sinoatrial node (SAN) on the wall of the right atrium sends an electrical signal across the right and left atria to contract and the blood moves into the ventricles. A layer of non-conductiv...

An enzyme called DNA helicase breaks the hydrogen bonds holding the complimentary base pairs together in a double stranded DNA molecule. This causes the DNA helix to unwind, exposing the unpaired bases. A...

Chi-squared is about establishing whether the difference in results between groups is likely to be due to chance, or due to some genuine difference in the groups' properties. It aims to answer the questio...

Across the membrane of a neuron, the membrane potential at rest is approximately -70mV. When a stimulus of some kind is detected by sensory receptors (for example the nociceptors on the skin surface which...

Atherosclerosis is a cardiovascular disease where fatty, cholesterol filled plaque builds up in the arteries, it is the main contributor to coronary artery disease. These plaques narrow the vessel and obs...