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1. Which of the following is not important in preventing backflow of blood?
 
 
 
 

Question 1 of 9

2. Which valve separates the left atrium from the left ventricle?
 
 
 
 

Question 2 of 9

3. Which of the following lists the valves in the order through which the blood flows from the vena cava through the heart?
 
 
 
 

Question 3 of 9

4. Which chamber initially receives blood from the systemic circuit?
 
 
 
 

Question 4 of 9

5. The ________ layer secretes chemicals that help to regulate ionic environments and strength of contraction and serve as powerful vasoconstrictors.
 
 
 
 

Question 5 of 9

6. The myocardium would be the thickest in the ________.
 
 
 
 

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7. In which septum is it normal to find openings in the adult?
 
 
 
 

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8. Describe how the valves keep the blood moving in one direction.

Question 8 of 9

9. Why is the pressure in the pulmonary circulation lower than in the systemic circulation?

Question 9 of 9