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What is the general structure of an animal cell?

An animal cell consists of many sub-cellular structures that allow it to live and function as part of the animals body. The cell consists of a cell membrane which houses all the cells components. Because ani...
MC
Answered by Megan C. • Biology tutor
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When a nerve impulse arrives at a synapse, it causes the release of neurotransmitter from vesicles in the presynaptic knob. Describe how.

When the action potential arrives at the presynaptic end of the neurone or nerve ending, the influx of ions along the axon body results in the depolarisation of the nerve cell and the presynaptic membrane. T...
PA
Answered by Philip A. • Biology tutor
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Explain how cystic fibrosis affects digestion, gas exchange and reproduction.

Background information I would give to the student: This question is a perfect example which shows that if you really understand the topic, it becomes easier to remember the facts for the questions relating ...
SG
Answered by Shaswath G. • Biology tutor
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What is the difference between the Parasympathetic Nervous System and the Sympathetic Nervous System?

The Nervous System can be split into three central pathways.The SNS and PNS are part of the Autonomic Nervous System, the autonomic nervous system is responsible for the involuntary actions of the human body...
VR
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Describe how phagocytosis of a virus leads to presentation of its antigens (3 marks)

Virus engulfed by phagocyte (broad immune response), destroyed using lysosomes (hydrolysis) and viral antigens presented on cell membrane (trigger specific immune response e.g. anti-bodies). Steps of phagocy...
BJ
Answered by Ben J. • Biology tutor
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