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As each O2 molecule binds to the haemoglobin, it alters the shape of the protein --> making subsequent binding more favourable. Therefore the affininity for oxygen will be greater in places with a high...

This is a really common question that people ask actually and I struggled with this when I did GCSE. It's a good idea to jot down the points you want to include whilst you're learning how to answer these ...

To expand the lungs and fill them with air, thoracic pressure decreases. This is done by the diaphragm contracting and flattening out and the external intercostal muscles raising the ribcage upwards and o...

There is a pre-synaptic and post-synaptic neuron. An impulse stimulates the presynaptic neuron, travelling down to the synaptic bouton. This releases neurotransmitters into the synaptic cleft, which diffu...

The answer is natural selection.  you have a colony of the bacterium and one bacterium develops a mutation which allows it to become resistant to some types of antibiotics. the bacteria that dont have the...