6. Arrange the route of a red blood cell beginning in the right atrium. 1. left atrium 2. mitral valve 3. left ventricle 4. right ventricle 5. tricuspid valve 6. pulmonary veins 7. pulmonary arteries $$ \begin{array}{ll} ext { a. } 2,4,7,6,1,5,3 & ext { d. } 2,4,6,7,1,5,3 \ ext { b. } 5,4,6,7,1,2,3 & ext { e. } 5,4,7,6,1,2,3 \ ext { c. } 5,3,7,6,1,2,4 & ext { f. } 2,3,7,6,1,5,4\end{array} $$

Question

6. Arrange the route of a red blood cell beginning in the right atrium. 1. left atrium 2. mitral valve 3. left ventricle 4. right ventricle 5. tricuspid valve 6. pulmonary veins 7. pulmonary arteries $$ \begin{array}{ll}	ext { a. } 2,4,7,6,1,5,3 & 	ext { d. } 2,4,6,7,1,5,3 \ 	ext { b. } 5,4,6,7,1,2,3 & 	ext { e. } 5,4,7,6,1,2,3 \ 	ext { c. } 5,3,7,6,1,2,4 & 	ext { f. } 2,3,7,6,1,5,4\end{array} $$

UpStudy AI · Accepted Answer

Let's trace the journey of a red blood cell step by step, beginning in the right atrium.

1. **Right Atrium to Tricuspid Valve**  
   The red blood cell starts in the right atrium and then flows through the tricuspid valve. In our list, the tricuspid valve is item $$5$$.

2. **Tricuspid Valve to Right Ventricle**  
   After passing through the tricuspid valve, the blood cell enters the right ventricle, which is item $$4$$.

3. **Right Ventricle to Pulmonary Arteries**  
   The right ventricle pumps the blood cell into the pulmonary arteries, item $$7$$. (These arteries carry deoxygenated blood to the lungs.)

4. **Pulmonary Arteries to Lungs to Pulmonary Veins**  
   In the lungs, blood becomes oxygenated and returns to the heart via the pulmonary veins, item $$6$$.

5. **Pulmonary Veins to Left Atrium**  
   The pulmonary veins deliver the oxygen-rich blood cell into the left atrium, item $$1$$.

6. **Left Atrium to Mitral Valve**  
   From the left atrium, the blood cell passes through the mitral valve, item $$2$$.

7. **Mitral Valve to Left Ventricle**  
   Finally, the cell enters the left ventricle, item $$3$$.

Thus, the complete route is:  
$$ 5 \rightarrow 4 \rightarrow 7 \rightarrow 6 \rightarrow 1 \rightarrow 2 \rightarrow 3 $$.

Among the given answer choices, option **e** corresponds to this sequence:

$$
5,\;4,\;7,\;6,\;1,\;2,\;3.
$$

So, the correct answer is **e**.
The correct sequence is 5, 4, 7, 6, 1, 2, 3, which is option e.

Arrange the route of a red blood cell beginning in the right atrium.

left atrium

mitral valve

left ventricle

right ventricle

tricuspid valve

pulmonary veins

pulmonary arteries

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Arrange the route of a red blood cell beginning in the right atrium. left atrium mitral valve left ventricle right ventricle tricuspid valve pulmonary veins pulmonary arteries