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By neurotransmitters. At a neuromuscular junction, the neurotransmitter is Acetylcholine released from vesicles in the pre-synaptic neurone. Receptors on the muscle cell surface bind acetylcholine in the ...

In the nervous system, information is carried by electrical impulses from sensory neurons to the brain, from the brain to motor neurons, and within the neurons of the brain itself. A synapse is a connecti...

CF is a homozygous recessive condition. This means that it is inherited, ie a child gets the condition by the genetic material passed on to it from its parents. Let's call the faulty allele f (which is al...

(This would be after I have introduced the punnett square - I will draw this out for the student) Remember that each parent contributes one allele for a given gene to their offspring. For cystic fibrosis ...

A mutation is a change in the DNA base sequence. This causes a change in the amino acid that is synthesised, and this could change the shape of the active site on an enzyme. The shape of the active site m...