Identify the correct order of structures in which venous blood must pass through in the pulmonary circuit.

1. Superior/Inferior vena cava

2. Right ventricle

3. Pulmonary artery

4. Capillaries of the lungs

5. Pulmonary trunk

6. Right atrium

Question

Identify the correct order of structures in which venous blood must pass through in the pulmonary circuit.

1. Superior/Inferior vena cava

2. Right ventricle

3. Pulmonary artery

4. Capillaries of the lungs

5. Pulmonary trunk

6. Right atrium

BlackTom AI · Accepted Answer

To begin, let's lay out the key components of the pulmonary circulation path for venous blood: the blood returns to the heart via the superior or inferior vena cava, enters the right atrium, moves to the right ventricle, is pumped into the pulmonary trunk, travels through the pulmonary arteries to the lungs, and then reaches the capillaries of the lungs for gas exchange.

Option A: 1; 2; 4; 6; 5; 3
- This sequence places the right ventricle (2) before the right atrium (6), which is incorrect because blood must pass into the right atrium before moving to the right ventricle. It also places the capillaries (4) before the atrium/ventricle stages that lead to them. Overall, this does not reflect the correct flow.

Option B: 1; 2; 6; 5; 3; 4
- Here, the blood is shown going from the vena cava (1) directly to the right ventricle (2) and then to the right atrium (6), which disrupts the actual order where the atrium must receive blood before it can enter the ventricle. The subsequent steps also misplace the chambers and vessels, making this sequence anatomically inconsistent.

Option C: 1; 6; 2; 5; 3; 4
- This one aligns with the real pathway: venous blood from the body returns via the vena cava (1) into the right atrium (6); it then moves to the right ventricle (2); from there it is pumped into the pulmonary trunk (5); the blood travels through the pulmonary arteries (3) to reach the lungs, and finally reaches the capillaries of the lungs (4) for gas exchange. The order follows the standard sequence of structures in the pulmonary circuit.

Option D: 2; 1; 6; 5; 3; 4
- Starting with the right ventricle (2) before the vena cava (1) is inconsistent with the physiology, since venous blood enters the heart via the vena cava first. This initial misplacement cascades into the rest of the chain, making the entire order incorrect.

In summary, the correct anatomical progression is from the vena cava into the right atrium, then the right ventricle, followed by the pulmonary trunk, then the pulmonary arteries, and finally the capillaries in the lungs. The only option that faithfully reproduces this sequence is the one that lists 1; 6; 2; 5; 3; 4, namely option C.

Identify the correct order of structures in which venous blood must pass through in the pulmonary circuit. 1. Superior/Inferior vena cava 2. Right ventricle 3. Pulmonary artery 4. Capillaries of the lungs 5. Pulmonary trunk 6. Right atrium单项选择题

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