Biology Circulation / Transport SZABMU 2024 Reconduct
PMDC Verified Question 9 of 54
All of the following are the characteristics of veins, except:
A
They have broad lumen
B
Direction of blood flow towards heart
C
Thin layer elastic fibers are present
D
Valves are present in the upper part of body
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Valves are present in the upper part of body
Concept:

The anatomical distribution of venous valves depends entirely on gravitational forces.

Formula:

None

Solution:

  • Veins have broad lumens (A is true), carry blood toward the heart (B is true), and have relatively thin elastic/muscular layers (C is true).


  • Valves exist to prevent backflow against gravity. Therefore, valves are highly abundant in the veins of the legs and arms (lower parts of the body).


  • Veins returning blood from the head and neck (the upper part of the body) rely on gravity to drain downwards and generally lack valves entirely. Thus, statement D is the exception.


Why other options are incorrect:

  • Options A, B, and C accurately describe the histology and physiology of veins.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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