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The three main kinds of valves in the human circulatory system are atrioventricular valves, semi-lunar valves and pocket valves. Atrioventricular...
Artificial classification is used to divide organisms by their characteristics, which can vary depending on the specific situation which you are considering. Features that are considered are known as anal...
Contain haemoglobin - a molecule that can bind reversibly to oxygen. Biconcave disk shape - increases surface area to allow more diffusion of oxygen. No nucleus - allows more space for haemoglobin. Flexib...
The cardiac cycle, by convention, is considered to begin with depolarisation of the sino-atrial node (SAN). This depolarisation spreads across the two atria, causing the right and left atria to contract. ...
An atheroma is the deposition of fatty material in the innermost lining of an artery (caused by the process of 'atherosclerosis'). Atheromas have a tendency to rupture and this increases the likelih...
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