cgier 30

Question 1

any injury caused by abormal air pressure is

Answer 1

-barotrauma
- often associated w scuba diving
- any sudden change in pressure

Question 2

as you descend

Answer 2

-the pressure increase and volume decrease ( boyels law)
- as you go 30 metres down, your lungs volume will be 1/4 and as u ascend they’ll be 4x their size
- changing in the volume leads to change in gauge pressure
- p total = p atm + pgh

Question 3

the total pressure increases by

Answer 3

1 atm erva 10 metres in depth

Question 4

scuba stands for —- and its an equipment that divers air at —

Answer 4

• self contained underwater breathing apparatus
• ambient pressure

Question 5

divers breathe

Answer 5

high pressure air, will experience:
- high p02 and pn2 ( daltons law)
- gas solubility in tissues will increase the gas partial pressure ( henrys law) , henrys law state the concntaration/solubilty of the gas in the liquid is directly proportional to its partial pressure gas above the surface

Question 6

decompression sickness is

Answer 6

• rapid pressure reduction
  -when the solibulitty of n2 and 02 increases in the tissues and the blood and causes a problem in the ascend.
• aka the bends , little bubbles

Question 7

as the divers ascend

Answer 7

the ambient pressure will reduce and the gas will come out of the solution

Question 8

divers need to ascend –

Answer 8

slow, 10m/min , to get rid of the excess micro bubbles through the lungs by normal respiration

Question 9

what happens if the diver ascends quickly

Answer 9

• the gas won’t have enough time to be expelled by respiration
• bubbles will begin to form all over the body
• the body has mechanisms to get read of excess 02 but not n2

Question 10

the bends is formed when

Answer 10

bubbles forming in then joints and the muscles which causes involuntary spams and lead to foetal position,

Question 11

effective treatment is by

Answer 11

• administering 02 and transport to recompression chamber
• hyperbaric treatment of DCS is at 18.5 m

Question 12

commercial divers who dive deeper than 60 metres use

Answer 12

heliox or try mix where the n2 is diluted or replaced by other gas as helium or argon

Question 13

symptoms can show after

Answer 13

24hrs bc some tissues as bone marrow and fatty tissues take longer to get rid of excess gas .
that’s why u can’t travel

Question 14

other forms of DCS

Answer 14

• sudden loss of cabins pressure in the airplane , need to wear a mask to avoid hypoxia or dcs
• caissons disease from underground
• spacewalker bc their suits work at 1/3 of p atm and they must decompress 2 hours beforehand