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Explain how arteries and veins differ in their structure and how this relates to their function? (4)

Arteries are vessels blood away from the heart whereas veins carry blood to the heart Arteries have thicker walls to cope with the higher pressure- muscle (contracts-to control blood flow) elastic (helps art...
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Answered by Ghazala T. • Biology tutor
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What factors affect transpiration rate?

One factor which affects transpiration rate is light. When it is lighter, the stomata is open, which allows carbon dioxide in for photosynthesis. This means that water can diffuse out the leaf, so there is a...
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Answered by Saman A. • Biology tutor
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Explain what 'water potential' is, and how it relates to bacterial cell death. (3 marks)

(1) Water potential is the measure of potential energy in water.(2) Water potential determines the tendency of water to move from one location to another, via osmosis. (3) If bacteria is surrounded with a so...
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Answered by Ann D. • Biology tutor
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How are lungs are adapted for gaseous exchange?

The alveoli are cell wall is one cell thick = short diffusion pathway. The alveoli are moist - so gasses can dissolve and move quicker. The alveoli are small and increase the surface area - diffuse quicker. ...
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Answered by Georgia H. • Biology tutor
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How does the human body's respiratory system enable the rapid exchange of gases between oxygen and CO2?

The blood capillaries surrounding the alveoli of the lungs provide them with a rich supply of flowing blood. This means that the oxygen depleted blood returning from the body picks up oxygen from inside the ...
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Answered by Shaakirah S. • Biology tutor
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