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Contain Haemoglobin, the molecule for carrying oxygen through the blood. Bi-concave shape, to give a large surface area for diffusion of oxygen. No nucleus to make more space for haemoglobin for oxygen trans...

We are going to look at how the lungs are adapted for gas exchange. In humans, we have two lungs. Air passes into the lungs through a tube called the trachea. The trachea splits into two smaller tubes called...

Inactive forms of the pathogen are injected into the body This stimulates the white blood cells to produce antibodies On reinfection, the antibodies will be produced rapidly and be removed from the body befo...

A synapse is the gap between two neurons. For an electrical impulse to travel from one neuron to the next, it must pass across a synapse.So, when an electrical impulse reaches the end of a neuron, it causes ...

An individual's genotype is the allelles which they have inherited (alleles are different versions of genes). An individual's phenotype is the characteristics that their genotype codes for. What a genotype l...