Anatomy of the Heart Worksheet with labeled structures for educational purposes.

Task: Label the parts of the heart in the provided diagram.

The image shows a detailed anatomical illustration of the human heart, with various structures labeled from a to p. Below is the solution with explanations for each label.

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#### Labels and Explanations:

1. a. Superior vena cava
- The superior vena cava is a large vein that carries deoxygenated blood from the upper body (head, arms, and chest) into the right atrium of the heart.

2. b. Pulmonary trunk
- The pulmonary trunk is the artery that arises from the right ventricle and branches into the left and right pulmonary arteries, which supply blood to the lungs for oxygenation.

3. c. Right atrium
- The right atrium is one of the four chambers of the heart. It receives deoxygenated blood from the body via the superior and inferior vena cava and pumps it into the right ventricle.

4. d. Tricuspid valve
- The tricuspid valve is located between the right atrium and the right ventricle. It prevents backflow of blood when the right ventricle contracts.

5. e. Chordae tendineae
- The chordae tendineae are thin, fibrous cords that attach the tricuspid valve to the papillary muscles in the right ventricle. They prevent the valve from being pushed backward into the atrium during ventricular contraction.

6. f. Papillary muscles
- Papillary muscles are muscular projections within the ventricles that anchor the chordae tendineae. They help maintain the proper positioning of the valves during heart contractions.

7. g. Right ventricle
- The right ventricle is one of the four chambers of the heart. It receives deoxygenated blood from the right atrium and pumps it into the pulmonary trunk for transport to the lungs.

8. h. Inferior vena cava
- The inferior vena cava is a large vein that carries deoxygenated blood from the lower body (legs, abdomen, and pelvis) into the right atrium of the heart.

9. i. Aorta
- The aorta is the largest artery in the body. It arises from the left ventricle and distributes oxygenated blood to all parts of the body except the lungs.

10. j. Left atrium
- The left atrium is one of the four chambers of the heart. It receives oxygenated blood from the lungs via the pulmonary veins and pumps it into the left ventricle.

11. k. Pulmonary veins
- The pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart.

12. l. Mitral (bicuspid) valve
- The mitral valve (also called the bicuspid valve) is located between the left atrium and the left ventricle. It prevents backflow of blood when the left ventricle contracts.

13. m. Left ventricle
- The left ventricle is one of the four chambers of the heart. It receives oxygenated blood from the left atrium and pumps it into the aorta for distribution throughout the body.

14. n. Interventricular septum
- The interventricular septum is the thick wall of muscle that separates the right ventricle from the left ventricle. It ensures that oxygenated and deoxygenated blood do not mix.

15. o. Trabeculae carneae
- The trabeculae carneae are ridges of muscle tissue found in the ventricles. They increase the surface area and contractility of the ventricles, enhancing their pumping efficiency.

16. p. Pericardium
- The pericardium is the protective sac surrounding the heart. It consists of two layers: the outer fibrous pericardium and the inner serous pericardium, which reduces friction during heart movements.

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Final Answer:

```
a. Superior vena cava
b. Pulmonary trunk
c. Right atrium
d. Tricuspid valve
e. Chordae tendineae
f. Papillary muscles
g. Right ventricle
h. Inferior vena cava
i. Aorta
j. Left atrium
k. Pulmonary veins
l. Mitral (bicuspid) valve
m. Left ventricle
n. Interventricular septum
o. Trabeculae carneae
p. Pericardium
```

Boxed Final Answer:
```boxed{
a. Superior vena cava
b. Pulmonary trunk
c. Right atrium
d. Tricuspid valve
e. Chordae tendineae
f. Papillary muscles
g. Right ventricle
h. Inferior vena cava
i. Aorta
j. Left atrium
k. Pulmonary veins
l. Mitral (bicuspid) valve
m. Left ventricle
n. Interventricular septum
o. Trabeculae carneae
p. Pericardium
}
```