Questions 1 - 10:
Complete the notes below. Write NO MORE THAN TWO WORDS for each answer.
Background
- Taking in oxygen; mammals - lungs; fish - gills
- Long-held dreams - humans swimming underwater without oxygen tanks
- Oxygen tanks considered too 1 and large
- Attempts to extract oxygen directly from water
- 1960s - prediction that humans would have gills added by 2
- Ideas for artificial gills were inspired by research on
- fish gills
- fish swim bladders
- animals without gills - especially bubbles used by 3
Building a simple artificial gill
- Make a watertight box of a materiaI which lets 4 pass through
- Fill with air and submerge in water Important that the diver and the water keep 5
- The gill has to have a large 6
- Designers often use a network of small 7 on their gill
Main limitation - problems caused by increased 8 in deeper water
Other applications
- Supplying oxygen for use on 9
- Powering 10 cells for driving machinery underwater