chapter  2
12 Pages

Enzymes and digestion

The human body is composed of some hundredthousand million cells, each of which is a functional unit, enclosed within its cell membrane. These cells are grouped together in the body to form tissues with specialized functions.Thus, some cells comprise connective tissue and bind together the various organs of the body, others are concerned with muscular and nervous tissue, while others form the skeletal framework of bone that contributes strength and rigidity to the body. Most organs contain several functional cell types.