A-LevelBiologyGas exchangeMay/June 2017Paper 1 Q331 Mark
Some of the requirements of an efficient gas exchange system are a large surface area and a short diffusion distance. What is correct about how alveoli are adapted to meet these requirements? [Table with columns 'large surface area', 'short diffusion distance' and rows A, B, C, D]
Alarge surface area collagen and elastin fibres that allow the alveoli to stretch, short diffusion distance an extracellular layer round the alveolus wall contains blood capillaries
Blarge surface area gases dissolve in a layer of liquid to speed up diffusion, short diffusion distance walls of alveoli are squamous epithelium
Clarge surface area many folded interconnected alveoli, short diffusion distance capillaries are next to alveolus wall
Dlarge surface area sac shape of alveoli formed by squamous cells, short diffusion distance red blood cells are very close to capillary walls
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep