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The lock and key model:

Only substrates of a specific shape that is complementary to the active site of an enzyme can fit into the active site, in a way that is analagous to a key fitting...

A hormone is a chemical messenger. It is produced by a gland and then travels in the blood to a specific target organ where it causes a response, changing the way the body functions. Hormones can be pr...

Energy in the form of ATP, which is used to fuel chemical reactions in our body as well as many other processes.

Waste products: Carbon dioxide and water.

A synapse is the tiny gap between two neurones. At a synapse information is passed across the gap via chemicals, called neurotransmitters, rather than using electrical impulses. When information passes...

The alveoli are sac like structures which have a large surface area to volume ratio allowing for fast diffusion of oxygen into the blood (Fick's law). This large SA:V ratio is generated because the alv...