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The walls of ventricles are much thicke...

The walls of ventricles are much thicker than atria. Explain. 

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### Step-by-Step Solution: 1. **Understanding the Structure of the Heart**: The heart is divided into four chambers: two atria (upper chambers) and two ventricles (lower chambers). Each chamber has a specific function related to blood circulation. 2. **Function of the Atria**: The atria serve as collecting chambers for blood returning to the heart. They receive blood from the body (right atrium) or lungs (left atrium) and have a relatively low-pressure system since they only need to push blood into the ventricles below them. 3. **Function of the Ventricles**: The ventricles, particularly the left ventricle, are responsible for pumping blood out of the heart to the rest of the body. This requires generating a significant amount of pressure to ensure that blood reaches all body parts effectively. ...
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