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Describe how the lungs are adapted for gas exchange (6 marks)

-There are a large number of alveoli , increasing the surface area available for gas exchange. The alveoli have many infoldings , further increasing the surface area. - The walls of the alveoli are thin , th...
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Answered by Anna A. • Biology tutor
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Explain the process of mitosis.

Mitosis is a process that is normally explained in four stages - prophase, metaphase, anaphase and telophase. In prophase , the chromosomes condense and clump together in the middle of the cell. They duplica...
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Answered by Megan L. • Biology tutor
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What are the main differences in composition of blood taken from an artery to blood taken from a vein?

An artery which principally supplies cells metabolism would contain more of the 'fuels' required such as oxygen and glucose. A vein typically carries blood containing the waste products of metabolism and the...
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Answered by Tegen W. • Biology tutor
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Explain how blood vessels reduce the amount of heat lost from the body. (3)

blood vessels narrow (vasoconstriction) reduces blood flow blood vessels are close to the surface of the skin less heat lost by radiation
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Answered by Soham S. • Biology tutor
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Describe how air is moved in to and out of your lungs.

The process of moving air into and out of your lungs is called ventilation, or breathing. Ventilating the lungs is brought about by the contraction and relaxation of the intercostal muscles and the diaphragm...
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Answered by Amy B. • Biology tutor
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