Question 6 (1 point) $$ \begin{array}{l} ext { Which is the correct pathway of circulation through the heart (some parts WILL be } \ ext { left out)? } \ ext { 1) Superior Vena Cava - Right Ventricle - Left AV Valve - Left Pulmonary Arteries } \ ext { - Lungs } \ ext { 2) Inferior Vena Cava - Right AV Valve - Right Atrium - Pulmonary Trunk - Left } \ ext { Ventricle } \ ext { 3) Right Atrium - Right Ventricle - Right and Left Pulmonary Veins - Lungs - } \ ext { Aortic Semilunar Valve } \ ext { 4) Right Ventricle - Pulmonary Trunk - Lungs - Bicuspid valve - Aortic Semilunar } \ ext { Valve }\end{array} $$ 2

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Question 6 (1 point) $$ \begin{array}{l}	ext { Which is the correct pathway of circulation through the heart (some parts WILL be } \ 	ext { left out)? } \ 	ext { 1) Superior Vena Cava - Right Ventricle - Left AV Valve - Left Pulmonary Arteries } \ 	ext { - Lungs } \ 	ext { 2) Inferior Vena Cava - Right AV Valve - Right Atrium - Pulmonary Trunk - Left } \ 	ext { Ventricle } \ 	ext { 3) Right Atrium - Right Ventricle - Right and Left Pulmonary Veins - Lungs - } \ 	ext { Aortic Semilunar Valve } \ 	ext { 4) Right Ventricle - Pulmonary Trunk - Lungs - Bicuspid valve - Aortic Semilunar } \ 	ext { Valve }\end{array} $$ 2

UpStudy AI · Accepted Answer

1. The correct blood flow through the heart (ignoring parts that are left out) is as follows:
   - Blood from the right ventricle is pumped into the pulmonary trunk.
   - From the pulmonary trunk, it goes to the lungs.
   - After oxygenation, blood returns to the left side of the heart.
   - It then passes through the bicuspid (mitral) valve into the left ventricle.
   - Finally, it is pumped out through the aortic semilunar valve into the aorta.

2. Analyzing each option:

- **Option 1:**  
     $$ 	ext{Superior Vena Cava} ightarrow 	ext{Right Ventricle} ightarrow 	ext{Left AV Valve} ightarrow 	ext{Left Pulmonary Arteries} ightarrow 	ext{Lungs} $$  
     This option incorrectly shows the blood entering directly into the right ventricle from the Superior Vena Cava (bypassing the right atrium) and uses the left AV valve out of sequence.

- **Option 2:**  
     $$ 	ext{Inferior Vena Cava} ightarrow 	ext{Right AV Valve} ightarrow 	ext{Right Atrium} ightarrow 	ext{Pulmonary Trunk} ightarrow 	ext{Left Ventricle} $$  
     Here, the Right AV valve is placed before the right atrium and the pathway abruptly moves from the pulmonary trunk to the left ventricle, skipping the lungs.

- **Option 3:**  
     $$ 	ext{Right Atrium} ightarrow 	ext{Right Ventricle} ightarrow 	ext{Right and Left Pulmonary Veins} ightarrow 	ext{Lungs} ightarrow 	ext{Aortic Semilunar Valve} $$  
     In this option the pulmonary veins (which return blood from the lungs to the heart) are mentioned before the lungs, which is out of order.

- **Option 4:**  
     $$ 	ext{Right Ventricle} ightarrow 	ext{Pulmonary Trunk} ightarrow 	ext{Lungs} ightarrow 	ext{Bicuspid Valve} ightarrow 	ext{Aortic Semilunar Valve} $$  
     Although this option starts with the right ventricle (omitting the right atrium), it correctly shows the sequence from the right ventricle to the pulmonary trunk, then to the lungs, and after lung oxygenation the blood goes through the bicuspid (mitral) valve followed by the aortic semilunar valve.

3. Since some parts are intentionally omitted, Option 4 best represents the correct order of circulation that includes the critical steps from the right ventricle to the lungs and then to the left side of the heart.

4. Therefore, the correct answer is:  
   **Option 4**.
The correct pathway of circulation through the heart is: 1. Right Ventricle → Pulmonary Trunk → Lungs → Bicuspid Valve → Aortic Semilunar Valve → Aorta. Therefore, the correct answer is **Option 4**.

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