EXERCISE 82 



HOW IS FOOD DISTRIBUTED THROUGH THE HUMAN BODY? THE FLOW OF 



BLOOD IN THE VEINS 



Directions. Allow the arm to hang downward ; grip the arm tightly above the elbow and note 

 the location and appearance of the veins of the lower arm. Then releasing the pressure on the 

 upper arm, hold the arm pointing upward and note the change in the appearance of the veins. 

 Account for this difference. Place your finger on a prominent vein and note the appearance of the 

 vein on both sides of the finger. Can you in this way determine the direction of the flow? Do 

 you feel any pulse beat in the veins? 



[117] 



