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What kinds of valves are found in the human circulatory system and how do they differ?

The three main kinds of valves in the human circulatory system are atrioventricular valves , semi-lunar valves and pocket valves . Atrioventricular valves are found in the heart and separate the atria and ve...
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Answered by Elanor B. • Biology tutor
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What are the two main forms of biological classification, and how do they differ?

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 analogo...
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Answered by Luke K. • Biology tutor
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How are red blood cells adapted to carry out their function?

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. Flexible ...
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Answered by Lily C. • Biology tutor
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Describe the electrical activity that occurs during the cardiac cycle?

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. The...
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Answered by Luke K. • Biology tutor
3077 Views

Describe how an atheroma may lead to a myocardial infarction.

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 likelihood of th...
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Answered by Jovian W. • Biology tutor
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