Oxygen Diffusion Path and Bronchi Structure
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1283. 9700_m20_qp_12 Q: 34
How many times must a molecule of oxygen pass through a cell surface membrane as it diffuses from inside an alveolus, through a cell in the capillary wall, to bind to a molecule of haemoglobin?
A 3
B 4
C 5
D 10
1284. 9700_s20_qp_11 Q: 33
Which structures are found in bronchi?
[Venn Diagram with labels: cartilage, smooth muscle, goblet cells and intersection zones A, B, C, D]
This question includes visual content: A Venn diagram consisting of three intersecting circles. Each circle is labeled with a tissue type: 'cartilage', 'smooth muscle', and 'goblet cells'. Areas of intersection are labeled with letters: 'A' (intersection of cartilage and smooth muscle), 'B' (intersection of all three), 'C' (intersection of smooth muscle and goblet cells), and 'D' (intersection of cartilage and goblet cells). The question text for 1284 asks which structures are found in bronchi.
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Let's solve this biology question about the gas exchange system. We need to count how many cell surface membranes a molecule of oxygen must cross to reach a red blood cell.
Gas Exchange Pathway
The question asks for the path from inside an alveolus, through a capillary wall cell, and finally binding to haemoglobin.
The Journey of Oxygen:
1. Inside alveolus
2. Alveolar wall (squamous epithelium)
3. Capillary wall (endothelium)
4. Red blood cell (to reach haemoglobin)
Let's draw this out to visualize every membrane crossing. First, we have the alveolar wall, which is made of squamous epithelium cells.
To leave the alveolus and enter the alveolar cell, the oxygen crosses its first membrane. Then it exits that same cell, crossing a second membrane.
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