1) Why does oxygen pass from the air space to a red blood cell in the alveolus (in the lungs?) a) Because there are lots of oxygen molecules in the air space b) Because oxygen moves up its concentration gradient c) Because carbon dioxide moves out of the bloodstream d) Because oxygen is at a higher concentration in the air space than in the blood plasma 2) Which term shows that some particles can pass into or out of the cell, but others can't a) Osmosis b) Partially permeable membrane c) Semi-permeable membrane d) Plasma cell membrane

Biology Unit 2 Revision 21

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