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Explain how the human body is adapted for gas exchange

Gas exchange occurs in the lungs where oxygen enters from the air and diffuses into the blood stream and carbon dioxide in moves the opposite direction. Oxygen is needed for respiration by the body, for exam...
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Answered by Louise A. • Biology tutor
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What happens to the arteries in coronary heart disease?

The blood vessels supplying the heart (coronary arteries) become narrowed or blocked. This is caused by plaque buildup in the artery walls. These plaques are made up of fatty deposits (cholesterol). Plaque b...
SK
Answered by Shivam K. • Biology tutor
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A wheat farmer uses fertiliser on his crop for several months. During this time the pond at the end of the field becomes covered in a thin green film and starts to smell. What process is responsible for this and how does it occur?

Fertilisers contain nitrates for use by plants for protein synthesis.In eutrophication, when it rains excess soil nitrates are washed in run-off to the pond. Water becomes nitrogen rich so surface algae thri...
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Inheritance and Genetics: Explain the offspring genotypes and phenotypes when two heterozygous individuals reproduce.

This is a common and important genetics question to study. First let's pick out the key terminology. Genotype is the genetic code that gives rise to a physical characteristic - a phenotype. At GCSE, all the ...
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Answered by Ashvin K. • Biology tutor
3294 Views

Describe the events that modulate the release of insulin in beta cells. (4)

This is a describe question - it should be answered directly with only the appropriate factual information. Glucose enters the beta cells via specific glucose transporters embedded in the cell membrane (GLUT...
Answered by • Biology tutor
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