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Date May 2022 Marks available 1 Reference code 22M.1.SL.TZ2.26
Level Standard level Paper Paper 1 Time zone Time zone 2
Command term Question number 26 Adapted from N/A

Question

The light micrograph shows two blood vessels, an artery and a vein, in transverse section.

[Source: Columbia Center for New Media Teaching and Learning, n.d. Epithelium: Simple Squamous Epithelium. [image online] Available at: http://www.columbia.edu/itc/hs/medical/sbpm_histology_old/lab/lab02_squamous.html [Accessed 29 November 2019].]

 

What explains the different shapes of these blood vessels?

A. Arteries do not have valves.

B. Muscle cells are found only in the walls of veins.

C. Arteries have a larger lumen-to-wall thickness ratio.

D. There are fewer elastic fibres in the walls of veins.

Markscheme

D

Examiners report

Very few candidates answered this correctly with many incorrectly answering C, that arteries have a larger lumen-to-wall thickness ratio than veins. The question was taken from 6.2 Identification of blood vessels as arteries, capillaries or veins from the structure of their walls.

Syllabus sections

Core » Topic 6: Human physiology » 6.2 The blood system
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