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Mitochondria and ribosomes are both structures inside the animal cell. Mitochondria are the site of respiration. They supply energy to the cell by aerobic respiration. Ribosomes are strucutres where prote...

There are 3 hormones mentioned in the AQA GCSE Biology specification. These are FSH (follicle stimulating hormone), LH (leuteinising hormone), and oestrogen. FSH and LH are produced by the pituitary gland...

A reflex action occurs very quickly, and does not involve the brain. The stimulus (e.g. a flame) is sensed by the receptor (the skin). The sensory neurone attached to the receptor sends an impulse to the ...

Gonorrhoea is caused by a bacteria whereas HIV is a virus. Antibiotics are only effective on bacterial diseases, but do not treat viruses as they are found inside the host cell. 

An unconsious action in response to a stimulus. These are very quick movements and have evolved to allow basic protection. For example, when you touch something hot, you automatically remove your hand bef...