s3 missing

Question 1

partial pressure of o2

Answer 1

13.3kPa

Question 2

atmospheric pressure

Answer 2

101kPa

Question 3

oxygen solubility constant

Answer 3

0.01mmol/L/kPa

Question 4

concentration of blood on Hb

Answer 4

8.935 mmol/L

Question 5

henrys law

Answer 5

the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid, and the gas’ solubility in the liquid

Question 6

equation henrys law

Answer 6

concentration of gas (mmol/L) = Kh x partial pressure of gas above liquid

Question 7

how much atmospheric gas pressure does water vapour pressure displace

Answer 7

6.28kPa

Question 8

partial pressure of o2 in atmosphere

Answer 8

21.1kPa

Question 9

how much of the atmosphere is o2

Answer 9

20.9%

Question 10

calculate the total URT gas pressure

Answer 10

101kPa - 6.28kPa = 94.72kPa

Question 11

partial pressure of oxygen of humidified air in URT clalculate

Answer 11

94.72 kPa x 0.209= 19.8kPa

Question 12

why alveolar O2 partial pressure less than atmospheric?

Answer 12

• water vapor pressure displaces 6.28kPa of atmospheric pressure
• lungs have old air in them with less o2, which equilibriates with new air and lowers pO2
• oxygen is constantly diffusing into capillary blood flowing past

Question 13

dead space

Answer 13

ventilation, no perfusion

Question 14

shunt

Answer 14

perfusion no ventilation

Question 15

what causes curve to shift to left, and what is the effect of this on o2 affinity

Answer 15

increased affinity, less o2 released

• reduced temperature
• lowered 2,3BPG
• lowered H+
• CO

Question 16

what causes curve to shift to right, and what is the effect of this on o2 affinity

Answer 16

lowered affinity, more o2 released

• increased temperature
• increased 2,3BPG
• increases H+

Question 17

effect of increased 23BPG in the blood of people who live at high altitutes

Answer 17

shifts HbO2 curve to right, causing more oxygen to be given up to tissues