6 levels of organisation within the framework of the body

Chemical- the body is made up of atoms and molecules. Molecules are atoms joined together. Two well known molecules are DNA and Glucose.
7 Essential atoms are Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Calcium and Sulphur.
Many supplements in the bodybuilding scene will attempt to manipulate these essential atoms.

Cellular- Molecules when combined form cells with specific chemical properties. These are the smallest actual unit and the different kinds of cells are muscle, nerve and epithelial

Tissue- These are groups of cells with material surrounding them that work together to perform a function. The 4 types of tissue are epithelial, connective, muscle and nervous tissue.
EPITHELIAL- covers surfaces, lines surfaces and forms glands
CONNECTIVE- connects, supports and protects and provides blood vessels
MUSCULAR- contracts for movement, generates heat
NERVOUS- sends information through impulses

Organ- a collection of tissues being 2 or more together to perform specific functions such as skin, bones, heart, lungs, liver, brain

System- a collection of related organs with a similar function for example the digestive system which extends from the mouth, salivary glands to the throat stomach and pancreas.

Organism- a collection of all the organs and systems within a unit such as a human body.