Solved Unit 20: Anatomy of the Heart Worksheet 1. a j m | Chegg.com - Free Printable

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

#### Solution:

The diagram shows a cross-section of the human heart, and we need to identify and label each part correctly. Below is the detailed explanation and labeling for each part:

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Labels and Explanations:

1. a. Superior vena cava
- The large blue vessel at the top left that brings deoxygenated blood from the upper body into the right atrium.

2. b. Inferior vena cava
- The large blue vessel at the bottom left that brings deoxygenated blood from the lower body into the right atrium.

3. c. Right atrium
- The chamber on the top right side of the heart that receives deoxygenated blood from the body via the superior and inferior venae cavae.

4. d. Right ventricle
- The chamber below the right atrium that pumps deoxygenated blood to the lungs via the pulmonary artery.

5. e. Interventricular septum
- The thick muscular wall that separates the right ventricle from the left ventricle.

6. f. Pulmonary valve
- The valve located at the exit of the right ventricle, which prevents backflow of blood into the right ventricle when it contracts.

7. g. Left ventricle
- The chamber on the bottom right side of the heart that pumps oxygenated blood to the body via the aorta.

8. h. Aortic valve
- The valve located at the exit of the left ventricle, which prevents backflow of blood into the left ventricle when it contracts.

9. i. Pulmonary arteries
- The vessels emerging from the top of the heart that carry deoxygenated blood from the right ventricle to the lungs.

10. j. Left atrium
- The chamber on the top left side of the heart that receives oxygenated blood from the lungs via the pulmonary veins.

11. k. Mitral (bicuspid) valve
- The valve between the left atrium and the left ventricle, which prevents backflow of blood into the left atrium when the left ventricle contracts.

12. l. Tricuspid valve
- The valve between the right atrium and the right ventricle, which prevents backflow of blood into the right atrium when the right ventricle contracts.

13. m. Pulmonary veins
- The vessels bringing oxygenated blood from the lungs into the left atrium.

14. n. Chordae tendineae
- The thin, fibrous strings that attach to the cusps of the atrioventricular valves (tricuspid and mitral valves) to prevent them from being pushed back into the atria during ventricular contraction.

15. o. Papillary muscles
- Muscles within the ventricles that anchor the chordae tendineae to the walls of the ventricles, helping to keep the atrioventricular valves closed during ventricular contraction.

16. p. Pericardium
- The outermost layer surrounding the heart, providing protection and reducing friction as the heart beats.

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Final Answer:

| Label | Part of the Heart |
|-------|-------------------|
| a | Superior vena cava |
| b | Inferior vena cava |
| c | Right atrium |
| d | Right ventricle |
| e | Interventricular septum |
| f | Pulmonary valve |
| g | Left ventricle |
| h | Aortic valve |
| i | Pulmonary arteries |
| j | Left atrium |
| k | Mitral (bicuspid) valve |
| l | Tricuspid valve |
| m | Pulmonary veins |
| n | Chordae tendineae |
| o | Papillary muscles |
| p | Pericardium |

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Boxed Final Answer:
\[
\boxed{
\begin{array}{ll}
a. & \text{Superior vena cava} \\
b. & \text{Inferior vena cava} \\
c. & \text{Right atrium} \\
d. & \text{Right ventricle} \\
e. & \text{Interventricular septum} \\
f. & \text{Pulmonary valve} \\
g. & \text{Left ventricle} \\
h. & \text{Aortic valve} \\
i. & \text{Pulmonary arteries} \\
j. & \text{Left atrium} \\
k. & \text{Mitral (bicuspid) valve} \\
l. & \text{Tricuspid valve} \\
m. & \text{Pulmonary veins} \\
n. & \text{Chordae tendineae} \\
o. & \text{Papillary muscles} \\
p. & \text{Pericardium} \\
\end{array}
}
\]