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Explain the role of ADH in regulating the water content of the blood.

ADH (anti-diuretic hormone) helps to regulate the water content of blood by influencing how much urine is produced by the kidneys. When blood volume increases, due to increased hydration, the osmolarity decr...
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Answered by Oliver T. • Biology tutor
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Describe a simple food chain and the trophic levels within it

Grass -> rabbit -> Fox -> Crow -> Bacteria + FungiGrass = producer - first trophic level, uses photosynthesis to convert carbon dioxide and water to glucose Rabbit = primary consumer - second tro...
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Answered by Ashley C. • Biology tutor
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Why does anaerobic respiration have a lower ATP yield than aerobic respiration? (4 marks)

During anaerobic respiration only glycolysis can occur as oxygen is not present to act as the final electron acceptor in oxidative phosphorylation, therefore only substrate level phosphorylation can occur. I...
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Answered by Amy D. • Biology tutor
12476 Views

Outline the action of B lymphocytes following initial contact with an antigen or antigen presenting cell. (6 marks)

There are 4 stages to the response of B lymphocytes upon contact with antigens. These are antigen presentation, clonal selection, clonal expansion and differentiation. During antigen presentation the lymphoc...
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Answered by Amy D. • Biology tutor
2995 Views

Describe the process of diffusion?

Diffusion is the process where water molecules move from a negative water potential to a more negative water potential through a semi permeable membrane.
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Answered by Fawcett G. • Biology tutor
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