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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
3645 Views

(diagram of compressed and enlarged cells) Why has the plant cell shrunk when put in salty water

This occurs due to the phenomenon of osmosis. The basic principle of osmosis is that when two substances of different saline concentration are separated by a permeable divider (plant cell wall) the concentra...
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Answered by Thea W. • Biology tutor
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Explain how blood is pumped through the body.

Blood from the veins is collected in the right and left atria of the heart. The atria can contract because of the impulses from the sinoatrial node (SA) (the heart’s natural pacemaker). When this happens, th...
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Answered by Iulia B. • Biology tutor
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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
18658 Views

Name the components/organelles of both animal & plant cells. Give a brief description of their functions.

Animal Cells Cell membrane - Made up of lipids and proteins and allows for passive diffusion into the cell. Cytoplasm - Contains cytosol & cell organelles. Nucleus - Controls the activities of the cell. ...
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Answered by Sameerah V. • Biology tutor
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