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Explain how skeletal muscle contracts.

There are several simple steps that occur each time a skeletal muscle contracts which follow the sliding filament model. Firstly a nerve impulse travels down a motor neuron releasing neurotransmitter acetylc...
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Answered by Yuval G. • Biology tutor
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Describe the process of transcription in detail (6 marks)

Transcription is the process by which a section of DNA acts as a template for the creation of a complementary mRNA strand. mRNA is needed for the creation of a polypeptide. An enzyme called DNA helicase bind...
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Answered by Katherine H. • Biology tutor
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Describe and explain the differences in the function of the sympathetic and parasympathetic nervous systems.

The sympathetic and parasympathetic nervous systems tend to have opposite effects on the organs which are innervated by their nerves. The Sympathetic NS innervates organs via the sympathetic chain and the pa...
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Answered by Amar S. • Biology tutor
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How does helicobacter pylori cause stomach ulcers?

It neutralises acid in the stomach and allows bacteria to damage the stomach epithelium.
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Answered by Saranya G. • Biology tutor
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Before a drug is sold and released to the public, what measures must scientists take to ensure the safety of a drug and why are these steps taken?

Phase I- The drug must be tested on animals and tissue culturesPhase II - The drug is tested on healthy volunteers in small dosesPhases III- The drug is tested on sick patients in small dosesSmall doses are ...
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Answered by Saranya G. • Biology tutor
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