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What is the difference between diffusion, osmosis and active transport?

Diffusion is the movement of particles, either in gas or solution, from an area of high concentration to an area of low concentration until the concentration in the whole area is equal. This also occurs acro...
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Answered by Samuel P. • Biology tutor
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explain how the human circulatory system is adapted to remove CO2 from tissues (3)

capillaries have a high surface area to volume ratio to allow fast diffusionCO2 can diffuse from cells to blood plasmathe lungs also contain capillaries allowing CO2 to diffuse into them prior to exhalation
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Answered by Cameron E. • Biology tutor
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Helicobacter pylori can cause stomach cancer. Describe how a person infected with Helicobacter pylori could also develop liver cancer.

Cancer is caused by the uncontrolled division of cells. If a cancer is benign, it will be a certain size and stay that size. However if it is malignant, then it will grow and get bigger in size. Eventually i...
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Answered by Adam S. • Biology tutor
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Describe the similarities and differences in form between DNA and RNA

DNA and RNA have many similarities. They are both formed of a backbone made from sugar and phosphate groups, however DNA is formed of the sugar deoxyribose, and RNA is formed of ribose sugars. Attached to th...
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Answered by Kristel B. • Biology tutor
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What role does acetylcholine have at the neuromuscular junction.

The neuromuscular junction is the meeting point between a nerve and a muscle, specifically a motor neurone and a muscle fibre. It is the way in which the brain communicates with the muscles of the body to in...
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Answered by Aaron S. • Biology tutor
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