A-LevelBiologyTransport in mammalsFeb/Mar 2019Paper 1 Q281 Mark
The photomicrograph shows a section through a structure found in mammals viewed using a light microscope. [Figure shows a cross-section of an artery or vein, labelled W points to the outer layer, x60 magnification] What are the main components of layer W?
Acollagen fibres only
Belastic fibres and collagen fibres
Csmooth muscle and elastic fibres
Dsquamous epithelial cells forming an endothelium
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The correct answer is C. This question tests the candidate's understanding of transport in mammals within the Biologysyllabus. The examiner's mark scheme requires...
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