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How does cholinergis transmission occur at a neuromuscular junction?

The presynaptic terminal is invaded by an action potential whihc causes an influx of calcium ions. The calcium ions then cause the vesicles cointaining acetylcholine to fuse with the presynaptic membrane and...
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Answered by Alex M. • Biology tutor
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Function of the heart.

The funtion of the heart is to supply the body with oxygenated blood. In humans this is done by use of a double circulatory system. This means that the blood enters the heart twice before it is pumped to the...
PC
Answered by Peter C. • Biology tutor
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Explain how transcription of genes occurs

Transcription occurs in the nucleus of the cell.The enzyme DNA helicase catalyses the 'unzipping' or splitting of the two DNA chains in the region of the gene by catalysing the breaking of the hydrogen bonds...
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Answered by Vanessa T. • Biology tutor
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Describe the tertiary structure of a polypeptide

Tertiary polypeptide structure is overall 3 dimensional shape of protein which forms as a result of amino acid R group interactions such as ionic salt interactions and disulphide bridges. These interactions ...
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Answered by Sam M. • Biology tutor
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Explain and define the roles of producers, primary, secondary and tertiary consumers, and decomposers

Every organism has a tropic relationship in a food chain. Producers are at the bottom of the food chain and they are autotrophs, meaning they get their nutrition through sunlight via photosynthesis, for exam...
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Answered by Jessica B. • Biology tutor
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