Introduction to the Body

Body Structure

Before you're able to move on and concentrate on the body systems and their functions, you need a general understanding of the body as a whole together with it's basic structures and arrangement.

The Cell

The cell is one of the most basic units of life. The cell is the smallest unit of life in our bodies. In the body, there are brain cells, skin cells, liver cells, stomach cells, and the list goes on. All of these cells have unique functions. And all have some recognisable similarities.

Biological cell

Complex Cell Structure

Cells need three main substances to allow them to function correctly:

Cells group together in the body to form tissues - a collection of similar cells that group together to perform a specialized function. There are 4 primary tissue types.


Organs are the next level of organisation in the body. Organs are more complex units than tissues. An organ is a structure of several different types of tissues so arranged that together they can perform a special function. There are many different organs in the body: the liver, kidneys, heart, even your skin is an organ.


A system is an organisation of two or more organs that arranged together they can perform complex functions for the body. There are 10 major organ systems in the human body. The following are the systems that we'll cover on this site:

Those not covered are:

Bookmark and Share

Introduction to Anatomy