1 88 HUMAN PHYSIOLOGY CHAP, xm 



9. The body is in the correct standing posture when the 

 feet are placed as in toeing a line, and the weight of the body 

 is thrown equally on the two legs. 



10. The body is in the correct sitting posture when the two 

 bones of the pelvis rest equally upon the seat, and the line of 

 direction falls within the line joining the points of support on 

 the seat. 



11. Clothing that does not fit properly deforms the bones 

 and interferes with the functional activity of the organs. 



12. Two of the most serious common deformities are a 

 curved spine and round shoulders. These deformities com- 

 press the thorax and abdomen, and disturb the respiration, 

 digestion, and circulation. 



13. School desks and seats are one cause of spinal curvature 

 and round shoulders. Schools should be furnished with ad- 

 justable seats and desks. 



