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Shivering involves rapid contracting and relaxing of the muscles. This requires energy and so the muscle cells respire in order to release this energy in the form of heat.

The heart is made of cardiac muscle and is split into 4 chambers known as atria and ventricles.Low pressure, deoxygenated blood from the tissue enters the right atrium via the superior and inferior vena c...

Auxin is a growth hormone released from the tip of a shoot. It is distributed uniformly along the shoot so it can diffuse down the entirety of the stem of the plant. Normally the auxin is broken down in s...

Animal and plant cells share many similarities. For example, they both have: a nucleus, which houses the genetic material; a cytoplasm, where the chemical reactions of the cell occur; a cell membrane, whi...

Diffusion is the passive (does not require energy input) movement of a substance down a concentration gradient from an area of high concentration to an a...