344 A YEAR IN SCIENCE 



4. Contrast the red and the white blood corpuscles 

 as to si^e, appearance, number, and use in the body. 



5. What is hemoglobin? 



6. HOAV is the amount of blood which goes to each 

 organ regulated? 



7. Why is it difficult to study immediately after 

 eating ? 



8. Describe the internal structure of the heart. 



9. Locate and give the function of the superior 

 vena cava, the inferior vena cava, the pulmonary 

 artery, the pulmonary vein, and the aorta. 



10. Trace a drop of blood from the left ventricle 

 throughout the body and back to the left ventricle. 



11. How many times does the heart beat per 

 minute? 



12. What is the advantage in having the walls of 

 the left side of the heart thicker than those of the 

 right? 



13. What is the function of the pericardium, the 

 auricles, and the ventricles? 



14. What is the pulse? Locate three places in the 

 body where a pulse may be felt. 



15. Give three ways in which arteries differ from 

 veins. 



16. What are capillaries ? Show by a diagram their 

 relation to arteries and veins. 



17. Give some first aid suggestions for the care of 

 a cut vein. For the care of a cut artery. 



T8. What is lymph? What is its function? 

 19. How does lymph get back into the blood 

 circulation ? 



