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Four characteristics of an efficient respiratory surface are: thin epithelium, large surface area, abundant capillaries, ventilation mechanism.

1. The polymerase chain reaction (PCR) is a process to 'amplify' DNA to provide sufficient quantities for further analysis.

PCR involves repeated cycles of heating and cooling of the reac...

The kidney is able to filter blood as it is made up of about a million filtering units. These units are called nephrons which are assosiated with capillaries. The blood flows to the glomerulus, which is a...

To start, it is important to have a clear understanding of what an enzyme is. An enzyme is a biological molecule which speeds up the rate of a reaction without being changed or used up in the process. Eac...

A: When we exercise the tissues of our body have an increased requirement for oxygen. The body facilitates this by increasing the respiratory and heart rate, thereby increasing the rate of gas exchange in...