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The black mamba’s toxin kills prey by preventing their breathing. It does this by inhibiting the enzyme acetylcholinesterase at neuromuscular junctions. Use your knowledge of muscle contraction to explain how this prevents breathing.

By inhibiting the enzyme acetylcholinesterase, the neurotransmitter acetylcholine does not get broken down. This causes acetylcholine to build up in the synapse between the motor neurones and muscles of resp...
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Answered by Tashi C. • Biology tutor
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Outline the importance of the junctions between neurones in the functioning of the nervous system

DEFINE: Key words What is a junction, what is a neurone and what is the nervous system? So, the nervous system connects all the nerve cells and fibres which transmit nerve impulses from one part of the body ...
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Answered by Natasha K. • Biology tutor
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Is it fair to describe Augustus' foreign policy as a matter of aggressive expansionism?

This question is highly debated by scholarship, but it's important in understanding what framework Augustus built for the Empire. Contemporary sources don't imply that Augustus was defensive at all; Properti...
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How would I go about answering the question "What was the primary motive of the people who went on the First Crusade?"

The first step in answering such a question is to clearly outline your thesis in the introduction. The introduction should be clear and concise, and show immediate engagement with the question. Try to avoid ...
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Answered by Sophy D. • History tutor
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Testing a question

Testing an Answer
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