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the relfex action consists of receptor and neurons communicating together. the brain is not involved the processing of this action. The basic pathway that the reflex arc follows is: stimulus (touching som...
Ice floats on water as it is less dense- due to lattice structure of water molecules in ice. This insulates the water below the ice, preventing it from freezing to ensure marine life has suitable temperat...
The influenza virus has a very high mutation rate. This means that its surface proteins (antigens) will change. Since a vaccine contains a specific antigen, if the virus switches to a different antigen, t...
The cardiac cycle consists of series of chamber systole and diastole. Systole is the name given to a period when cardiac muscle contract to cause blood ejection from the respective chamber to another. Dia...
Size: mitochondria are 2uM in diameter, similar to bacteria. Also applies to genome size and content, suggesting an 'endosymbiosis' event.
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