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GCSE

Describe the structure of a standard eukaryotic animal cell

The cell has an outer membrane known as the cell membrane, which envelops the cytoplasm. The cell also contains mitochondria which work to provide the cell with energy (in the form of ATP) and a nucleus, ...

Answered by Safia A. • Biology tutor

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What is a synapse and how is information transmitted across it?

Synapse = the junction between two neurones (nerve cells) OR the junction between a neuron and an effector cell such as a muscle cell

A synapse between two neurones consists of:

Answered by Emma Louisa S. • Biology tutor

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What are the differences between the structure and function of arteries and veins?

Arteries are blood vessels that carry blood away from the heart. They have thicker walls than veins in order to cope with far higher blood pressure level...

Answered by William H. • Biology tutor

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What is a pathogen?

An organism that causes disease e.g. bacteria, virus

Answered by Erin W. • Biology tutor

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Why does an increased heart rate during exercise help muscles contract?

An increased heart rate will cause an increase in blood flow around the body (increased cardiac output). This means that there will be more oxygen and more glucose being supplied to the muscles. Since oxy...

Answered by Adam D. • Biology tutor

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