The layer that lines the chambers of the heart is the **Endocardium**.

### Explanation:
1. **Endocardium**: This is the innermost layer of the heart, which lines the chambers and is in direct contact with the blood.
2. **Myocardium**: This is the thick, muscular middle layer responsible for the heart's contractions.
3. **Epicardium**: This is the outer layer of the heart wall, which also serves as a protective layer.
4. **Pericardium**: This is a fibrous sac that surrounds the heart, providing protection and anchoring it to surrounding tissues.

In the context of the heart's structure, the endocardium is essential as it creates a smooth lining for blood flow and helps prevent blood clots. Therefore, the correct answer to your question is **Endocardium**.

Question

The layer that lines the chambers of the heart is the **Endocardium**.

### Explanation:
1. **Endocardium**: This is the innermost layer of the heart, which lines the chambers and is in direct contact with the blood.
2. **Myocardium**: This is the thick, muscular middle layer responsible for the heart's contractions.
3. **Epicardium**: This is the outer layer of the heart wall, which also serves as a protective layer.
4. **Pericardium**: This is a fibrous sac that surrounds the heart, providing protection and anchoring it to surrounding tissues.

In the context of the heart's structure, the endocardium is essential as it creates a smooth lining for blood flow and helps prevent blood clots. Therefore, the correct answer to your question is **Endocardium**.

Knowee AI · Accepted Answer

The layer that lines the chambers of the heart is the **Endocardium**.

### Explanation:
1. **Endocardium**: This is the innermost layer of the heart, which lines the chambers and is in direct contact with the blood.
2. **Myocardium**: This is the thick, muscular middle layer responsible for the heart's contractions.
3. **Epicardium**: This is the outer layer of the heart wall, which also serves as a protective layer.
4. **Pericardium**: This is a fibrous sac that surrounds the heart, providing protection and anchoring it to surrounding tissues.

In the context of the heart's structure, the endocardium is essential as it creates a smooth lining for blood flow and helps prevent blood clots. Therefore, the correct answer to your question is **Endocardium**.

What layer lines the chambers of the heart?Multiple ChoiceEndocardiumMyocardiumEpicardiumPericardium

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What layer lines the chambers of the heart?

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