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White blood cells produce antibodies which are produced rapidly upon re-infection and these antibodies kill pathogens.

Mitosis is the type of cell division which produces daughter cells which are genetically identical to the parent cells. This type of cell division is needed for growth and repair. In mitosis in human cell...

Diffusion may be simple, whereby solutes travel through the phospholipids in the cell membrane as they have the same polarity as a lipid or are small enough to do so.Or, diffusion is faciliated and this i...

A tropism is a growth in a plant in response to a stimulus. The stimulus could be a change in the direction of light or a water source. To recap, a stimulus is a change in the environment of an organism t...

The blood in the capillary has just returned to the lungs from the rest of the body, so contains a low concentration of oxygen. The alveolus contains air that has just been breathed in by ventilation, so ...