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• Blood-glucose levels are maintained within narrow limits so that there are sufficient amounts of glucose in the blood (for respiring cells) but also not too high levels that will disturb the osmotic...

After consumption of a meal the levels of glucose in the blood rise. Receptors on beta cells detect this change. The beta cells are in the Islets of Langerhans of the pancreas. They secrete insulin in res...

A mutation will randomly occur in individuals within a species, providing a larger variation in genes. This mutated gene may produce characteristics which are beneficial for the individual in their enviro...

The synapse is a structure that permits a neuron to send an electrical or chemical signal to another neuron. It is where neurones can communicate with each other.

It contains a pre-synapti...

Mitosis is the process of division of a single cell to create two identical daughter cells. It involves four distinct phases: prophase, metaphase, anaphase and telophase, followed by cytokinesis. Each of ...