Structure of the Heart

Part A

Match the terms in column A with Column A

a. aorta b. atrioventricular sulcus c. atrium d. bicuspid (mitral) valve e. cardiac vein f. coronary artery g. coronary sinus h. endocardium i. interventricular sulcus j. myocardium k. papillary muscle l. pericardial cavity m. pericardial sac n. pulmonary trunk o. tricuspid valve the descriptions in column B. Place the letter of your choice in the space provided.

Column B _ 1. upper chamber of the heart

_ 2. structure from which chordae tendineae originate

_ 3. prevents blood movement from right ventricle to right atrium

_ 4. double-layered membrane around heart

_ 5. groove separating left and right ventricles

__6. prevents blood movement from left ventricle to left atrium

__7. gives rise to left and right pulmonary arteries

__8. drains blood from myocardium into right atrium

__9. inner lining of heart chamber

__10. layer largely composed of cardiac muscle tissue

__11. space containing serous fluid to reduce friction during heartbeats

__12. drains blood from myocardial capillaries

__13. supplies blood to heart muscle

__14. distributes blood to body organs (systemic circuit) except lungs

__15. groove separating atrial and ventricular portions of heart

Part B

Complete the following: 1. Compare the structure of the tricuspid valve with that of the pulmonary valve.

2. Describe the action of the tricuspid valve when you squeezed the water-filled right ventricle.

3. Describe the function of the chordae tendineae and the papillary muscles.

4. What is the significance of the difference in thickness between the wall of the aorta and the wall of the pulmonary trunk? _

5. List in order the major blood vessels, chambers, and valves through which a drop of blood must pass in traveling from a vena cava to the aorta. _

Critical Thinking Application

What is the significance of the difference in thickness of the ventricular walls?

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Essentials of Human Physiology

Essentials of Human Physiology

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