Top answers

Name three non-specific human defences against diseases

skin - acts as a physical barrier; mucus and ciliated cells on mucous membrane in trachea - catch pathogens and sweep them up out of lungs; stomach acid - kills bacteria
IH
Answered by Israel H. • Biology tutor
2619 Views

Describe two differences and two similarities between animal cells and plant cells.

Differences:Plant cells have cell walls, animal cells do not.Plant cells have vacuoles, animal cells do not.Plant cells have chloroplasts, animal cells do not.Similarities:Both plant and animal cells have ce...
AH
Answered by Anna H. • Biology tutor
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How does blood flow through the heart?

(First would talk through the structure of the heart using a diagram). Deoxygenated (lacking oxygen) blood from the body arrives into the heart via the vena cava. This empties into the right atrium and then ...
KM
Answered by Kieran M. • Biology tutor
3347 Views

Describe the structure of a plant and explain it's functions. (6 marks)

A waxy cuticle is present. This is a waterproof, transparent layer that prevents evaporation of water due to heat from the sun. Because it is transparent, it allows sunlight to pass through to the palisade l...
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Answered by Uswa S. • Biology tutor
12866 Views

How does the body fight off an infection? Like when someone catches a cold.

The body has many ways in which it deals with 'foreign invaders', like a rhinovirus (the virus responsible for the common cold). Once an infective micro-organism enters the body, lots of different cell types...
AC
Answered by Alisha C. • Biology tutor
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