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The lock and key model refers to an analogy used to describe the specific action of an enzyme with a substrate . During this process, the enzyme is acting as the lock and has a section called the active site...

An antibody is a chemical released during an infection by lymphocytes that attach to specific antigens.

Many alveoli which provide a large surface area for rapid diffusion. The walls of the capillaries are only one cell thick which provides a short diffusion pathway, allowing rapid diffusion. Blood circulation...

A mitochondria is found inside of the cell, and it is used to make energy (or ATP).

At each junction there is a neurone that comes before it called the presynaptic neurone and one that comes after called the post synaptic neurone and the space between the two neurones is called the synapse....