io HUMAN PHYSIOLOGY CHAP, i 



6. A cell is any small mass of living matter containing a 

 nucleus. It is the unit of structure and function in both ani- 

 mal and plant life. 



7. The human body consists of millions of cells, each of 

 which must have food to keep it alive and in good working 

 condition. 



8. In some respects the life and activity of each cell may be 

 compared to that of an individual person in a large city. 



9. It is important to remember that each cell in the human 

 body is a living unit, having its own needs and doing its own 

 work. 



10. The human body is made up of several systems; each 

 system is composed of organs ; every organ is constructed out 

 of tissues j and a tissue in turn is made up of cells. 



