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4 b Show the route an oxygen molecule takes from the lungs to a leg muscle cell.

6. 4 a Copy and complete the flowchart ‘small intestine  capillary in small intestine’ to show the route a glucose molecule takes from the small intestine to a leg muscle cell.

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4 b Show the route an oxygen molecule takes from the lungs to a leg muscle cell.

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  1. 6 4 a Copy and complete the flowchart ‘small intestine  capillary in small intestine’ to show the route a glucose molecule takes from the small intestine to a leg muscle cell. small intestine  capillary in small intestine  vein  right side of heart  lungs  left side of heart  artery  capillary in leg muscle  leg muscle cell

  2. 6 4 b Show the route an oxygen molecule takes from the lungs to a leg muscle cell. lungs  left side of heart  artery  capillary in leg muscle  leg muscle cell

  3. 5 a Which side of the heart is bigger? 5 the left side

  4. 5 b Why is this? 6 Because it has to be more powerful to pump blood around the whole body (not just to the lungs).

  5. 5 c What do the heart valves do? 5 Stop blood flowing the wrong way through the heart.

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