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Describe and explain the effect of an increase in muscular activity on the heart rate.

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 chemorecep...
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Answered by Shauna W. • Biology tutor
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Describe what happens in a healthy person when the pancreas detects a rise in blood sugar level.

The pancreas responds by releasing insulin. This causes glucose to move into the cells.
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Answered by Alfie B. • Biology tutor
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Explain how shivering helps to raise a persons body temperature.

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.
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Answered by Alfie B. • Biology tutor
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Describe blood flow through the heart

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 cava...
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Answered by Claire H. • Biology tutor
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Explain how Auxin is used to cause phototropism in plants.

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 sunl...
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Answered by Caillan L. • Biology tutor
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