14. Short answer questions IV

1. What are heart sounds? How are they produced?

 

a. The rhythmic closure and opening of the valves cause the  of the heart.

 

b. The beating heart produces sounds that can be heard by placing the ear against the chest or using a .

 

c. The first sound  is pitched and of longer duration. It is produced by the closure of  and tricuspid valves after the beginning of ventricular systole.

 

d. The second sound  is , louder and of shorter duration. It is produced by the closure of  valves at the end of the ventricular systole.

 

2. What is the importance of valves in the heart?

 

a. Valves are flaps that regulate the flow of blood in a  direction.

 

b. The valves also prevent the  flow of blood.

 

c. There is presence of  types of valves in the heart.