Film: 4716

Medicine | 1950 | Sound | B/W


21ft Plants and animals live by burning food
35ft Using oxygen
105ft Burning sugar needs oxygen
156ft Forms carbon dioxide
170ft Boy exhales carbon dioxide
185ft Breath warm
239ft Diagram of respiratory passages
262ft Capillaries
323ft Bell jar with diaphragm represents chest
434ft More air expelled after exercise.

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