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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 ...
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). Plaqu...
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 t...
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 t...
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 membr...
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