Which type of blood circulation is found in the mammalian heart?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Structure of the Mammalian Heart:**
- The mammalian heart is a muscular organ that consists of four chambers: two atria (left and right) and two ventricles (left and right).

2. **Blood Flow in the Heart:**
- Deoxygenated blood returns to the heart from the body through the vena cava into the right atrium.
- From the right atrium, the blood flows into the right ventricle.
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