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Describe and explain how the human lungs are adapted for efficient gas exchange (3 marks)

There are millions of alveoli (gas exchange surface), so they have a very large surface area collectively, which is further increased by having a folded membrane. A larger surface areas means there is a fast...
Answered by • Biology tutor
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how would you describe the structure of the small intestine in relation to its function?

the small intestines function is for the reabsorption of nutrients into the blood. The small intestine has multiple structural adaptations in relation to its function, primarily the mucosa which is a layer c...
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Answered by rosie M. • 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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Why is there a leading and lagging strand during DNA replication

The double stranded DNA is first unzipped by an enzyme called helicase. Helicase separates the two strands of DNA, and creates the replication fork. Essentialy two single stranded DNA chains are created, bot...
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Answered by Mark N. • 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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