Search over 10,000 free study notes

When an action potential reaches the end of one neurone, it cannot simply move to the next one as there is a gap (the synapse or synaptic cleft) between the two neurones. Instead, when th...

There are two types of cell called Eukaryotic cells and Prokaryotic cells. Eukaryotes are organisms made up of eukaryotic cells which include animals, plants and fungi (you can remember this as YOU are a ...

The heart made up of four chambers; two atria at the top and two ventricles at the bottom. There are effectively two pumps. The pump on the right side of the heart sends blood to the lungs to be oxygenate...

According to Darwin's theory, genetic variation within the population means that some elephants are born with longer noses. Longer noses are better suited to the environment, so longer-nosed elephants are...

Mutation, meiosis and sexual reproduction causes variation amoung members of the same species. Species tend to produce more offspring than the environment can support leading to competition for food or pr...