Question at position 5 The __________ and __________ fissures divide the lobes of the right lung.oblique; inferiorvertical; horizontaloblique; horizontalsuperior; inferiorSingle choice
A
oblique; inferior
B
vertical; horizontal
C
oblique; horizontal
D
superior; inferior

Question

Question at position 5 The __________ and __________ fissures divide the lobes of the right lung.oblique; inferiorvertical; horizontaloblique; horizontalsuperior; inferior

BlackTom AI · Accepted Answer

The lobes of the right lung are separated by the oblique (major) and horizontal (minor) fissures.

1) Relevant knowledge points and concepts
- The right lung has three lobes: superior (upper), middle, and inferior (lower).  
- A fissure is a deep groove that separates lung lobes. The right lung has two fissures: the horizontal (minor) fissure and the oblique (major) fissure. The left lung has a single oblique fissure dividing its two lobes.

2) Step-by-step reasoning
- Step 1: List the lobes of the right lung: superior, middle, inferior.  
- Step 2: Identify which fissures separate these lobes. The horizontal fissure runs transversely on the anterior aspect of the right lung and separates the superior lobe from the middle lobe. The oblique fissure runs from the posterior lung surface down toward the diaphragm and separates the middle lobe from the inferior lobe (and also separates superior from inferior on the left lung).  
- Step 3: Combine these separations: to divide the three right-lung lobes you need both the horizontal and the oblique fissures.

3) Calculations/intermediate steps
- No numerical calculations are required. Intermediate anatomical mapping: superior ↔ middle is separated by horizontal fissure; middle ↔ inferior is separated by oblique fissure.

4) Why the correct answer is correct
- Because only the horizontal fissure separates superior and middle lobes, and the oblique fissure separates middle and inferior lobes, both fissures together divide all three lobes of the right lung. They are the standard anatomical fissures named for the right lung.

5) Why the other options are incorrect
- "oblique; inferior": "inferior" is not a fissure (it is a lobe), so incorrect.  
- "vertical; horizontal": "vertical" is not the accepted name of a lung fissure; the correct term is "oblique" for the major fissure.  
- "superior; inferior": these are lobe names, not fissures, so incorrect.

Conclusion: The correct choice is "oblique; horizontal," which matches the provided answer.

Question at position 5 The and fissures divide the lobes of the right lung.oblique; inferiorvertical; horizontaloblique; horizontalsuperior; inferiorSingle choice

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