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An increase in muscular activity increases the rate of aerobic respiration. As a result, more carbon dioxide is formed in the Krebs cycle and the pH is lowered. This reduction in pH is detected by chemore...

The pancreas responds by releasing insulin. This causes glucose to move into the cells.

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...