Which of these flowcharts correctly shows the circulation of blood in the human body?

Options

A.
B.
C.
D.

Answer

To determine which flowchart correctly shows the circulation of blood in the human body, we need to understand the basic pathway of blood circulation. Here is a step-by-step solution:

### Step 1: Understand the Circulation Process
Blood circulation in the human body involves two main pathways: the systemic circulation and the pulmonary circulation. Deoxygenated blood returns to the heart, is sent to the lungs for oxygenation, and then oxygenated blood is sent back to the body.

### Step 2: Identify the Components of Circulation
1. **Deoxygenated Blood**: Blood that has delivered oxygen to the body and is returning to the heart. It enters the right atrium of the heart.
2. **Right Ventricle**: Pumps deoxygenated blood to the lungs via the pulmonary artery.
3. **Lungs**: Blood picks up oxygen and releases carbon dioxide.
4. **Oxygenated Blood**: Blood returns to the heart via the pulmonary veins into the left atrium.
5. **Left Ventricle**: Pumps oxygenated blood to the rest of the body through the aorta.

### Step 3: Analyze the Flowchart Options
- **Option 1**: Shows blood moving from the upper part of the body directly back to the upper part without going through the heart and lungs. This is incorrect.
- **Option 2**: Indicates blood moving from the upper part of the body to the lungs, then back to the upper part of the body without passing through the heart. This is also incorrect.
- **Option 3**: Shows blood moving from the upper part of the body to the heart (deoxygenated), then to the lungs for oxygenation, back to the heart (oxygenated), and finally to the upper part of the body. This correctly represents the circulation process.

### Step 4: Conclusion
The third option correctly illustrates the flow of blood in the human body, showing the necessary steps of deoxygenated blood returning to the heart, moving to the lungs, and then oxygenated blood being sent back to the body.

### Final Answer
The correct flowchart is **Option 3**.

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