THE CIRCULATION. 75 



2, Where is it situated ? 



3, What is the pericardium ? 



4, How is friction from the movements of the heart avoided ? 



5, Where is the apex of the heart ? How high does it extend ? 

 How is it held in place ? How large is it ? 



6, How is its interior divided ? Name its cavities. What is the 

 size of each ? What is the thickness of their walls ? 



7, Describe the passage between the right auricle and ventricle, 

 and its valve. What vessels open into the right auricle ? 



8, What vessel opens out of the right ventricle ? What is its 

 course ? What vessels empty into the left auricle ? 



9, Describe the semilunar valves of the pulmonary artery. 



10, Describe the passage between the left auricle and ventricle, 

 and its valve. 



11, What is the difference between the left and the right 

 ventricle ? 



12, Describe the aorta and its valves. 



13, Describe the muscle of the heart. 



SECTION III. 1. What does the heart do ? 



2, Does the heart get tired ? 



3, How does the heart rest ? 



4, How many times does the heart beat in a minute ? 



5, What causes make the number of beats in a minute greater 

 or less ? ^ 



6, Why may the heart be called a double pump ? 



7, What is the lesser circulation V What is the greater circula- 

 tion? 



8, Describe in full a contraction of the heart. 



SECTION IV. 1. What sounds does the heart make, and how ? 



SECTION V. 1. Describe the course and termination of the 

 aorta. 



2, Where is the femoral artery ? the tibial ? 



3, Where are the carotids, the subclavian arteries, the axillary, 

 the brachial, the radial, the ulnar ? 



4, Do large arteries run as near the surface as large veins ? 



5, How are the veins named ? Where are the jugular veins ? 



