Question

a. major heart structures and great vessels
fill in the blank with the term that fits the description.

1. arteries that supply blood to cardiac muscle
2. layer of heart wall containing cardiac muscle
3. extensions of the atria
4. heart is located here (area between the lungs)
5. lines the heart chambers
6. pointed inferior part of the heart
7. two heart pumps; lower heart chambers
8. superior heart chambers
9. another name for visceral pericardium
10. atria compose this on the posterior surface of heart
11. blood pumped by right ventricle (oxygen - rich or oxygen - poor)
12. blood pumped by left ventricle (oxygen - rich or oxygen - poor)
13. cone - shaped ridges of cardiac muscle that attach to chordae tendinae
14. ridges of cardiac muscle in ventricles
15. ridges of cardiac muscle in anterior wall of right atrium
16. tendon - like cords attached to av cusps
17. blood vessel that returns blood from the body inferior to the heart
18. the valve located between the left ventricle and the aorta
19. a membrane between the atria that closes after birth
20. the valve located between the right atrium and right ventricle

Explanation:

1. Coronary arteries supply blood to the cardiac muscle.
2. The myocardium is the layer of the heart wall containing cardiac muscle.
3. Auricles are extensions of the atria.
4. The mediastinum is the area between the lungs where the heart is located.
5. The endocardium lines the heart chambers.
6. The apex is the pointed inferior part of the heart.
7. Ventricles are the two lower heart chambers (the heart's pumps).
8. Atria are the superior heart chambers.
9. The epicardium is another name for the visceral pericardium.
10. The base of the heart is composed of the atria on its posterior surface.
11. The right ventricle pumps oxygen - poor blood (as it sends blood to the lungs for oxygenation).
12. The left ventricle pumps oxygen - rich blood (as it distributes oxygenated blood to the body).
13. Papillary muscles are cone - shaped ridges of cardiac muscle that attach to chordae tendinae.
14. Trabeculae carneae are the ridges of cardiac muscle in the ventricles.
15. Pectinate muscles are the ridges of cardiac muscle in the anterior wall of the right atrium.
16. Chordae tendinae are tendon - like cords attached to AV cusps.
17. The inferior vena cava is the blood vessel that returns blood from the body inferior to the heart.
18. The aortic semilunar valve is located between the left ventricle and the aorta.
19. The foramen ovale (fossa ovalis after closure) is the membrane between the atria that closes after birth.
20. The tricuspid valve is located between the right atrium and right ventricle.

Answer:

1. Coronary arteries
2. Myocardium
3. Auricles
4. Mediastinum
5. Endocardium
6. Apex
7. Ventricles
8. Atria
9. Epicardium
10. Base of the heart
11. Oxygen - poor
12. Oxygen - rich
13. Papillary muscles
14. Trabeculae carneae
15. Pectinate muscles
16. Chordae tendinae
17. Inferior vena cava
18. Aortic semilunar valve
19. Foramen ovale (fossa ovalis)
20. Tricuspid valve