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Describe how blood is pumped around the heart and the body.

Deoxygenated blood from the body is delivered to the right atrium by the vena cava. The right atrium contracts and blood flows into the right atrium. The right ventricle then contracts and blood is pumped to...
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Answered by Bel R. • Biology tutor
3285 Views

How does the water potential in the medulla of the kidney remain lower than the water potential in the loop of Henle?

The loop of Henle is designed so that the water moves out of the thinner walled descending limb by osmosis and then ions such as Na+ and Cl- are actively transported out of the ascending limb. This active tr...
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Answered by Oliver G. • Biology tutor
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three part question 1. what are dissacharides 2. what are maltose, lactose and sucrose formed of 3. what is the bond between them called

the biological molecule formed from the condensation reaction between 2 monosaccharidesmaltose is 2 glucose monomers, lactose is glucose + galactose and sucrose is glucose + fructosea glycosidic bond
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Answered by Omkaar D. • Biology tutor
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How does the kidney work?

The kidney is the body's filtration system, and works by separating the fluid and cells that make up blood, then selectively reabsorbing what is still useful, so that we don't lose anything valuable but can ...
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Answered by Nkosi Y. • Biology tutor
3658 Views

When a vaccine is given to a person, it leads to the production of antibodies against a disease-causing organism. Describe how. (5 marks)

With these 5 and 6 mark questions, one of the main skills required is being able to describe the process in sufficient detail, without wasting time with unnecessary information. For example in this question,...
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Answered by Thomas R. • Biology tutor
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