19J 



A TEXTBOOK OF PHYSIOLOGY 



in different vessels and postures, vary with the hydrostatic pressure 

 of the column of blood which lies above the point of measurement. 

 In the horizontal posture the pressure is practically the same in all 

 the big arteries. In the standing position the arterial pressure in the 



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arteries of the leg is higher than in the arm by the height of the column 

 of blood separating the two points of measurement (see p. 200). 



A difference between arm and leg pressures in the horizontal 

 position can be brought about in the normal person by violent exercise, 

 for this increases the height of the systolic wave. The leg arteries, 



