Gas Transport

Question 1

how is oxygen carried in the blood

Answer 1

2 forms:
1 - dissolved
2 - bound to haemoglobin (Hb)

Question 2

how much dissolved oxygen is present in the blood

Answer 2

small amount that is proportionate to the partial pressure

Question 3

haemoglobin structure

Answer 3

consists of 2 alpha and 3 beta chains forming a globular protein.
each chain has a heme group attached which contains a reduced form of iron which is the binding site of O2

Question 4

by what process does gas move through the respiratory system

Answer 4

diffusion

Question 5

what does the oxyhemoglobin dissociation curve show

Answer 5

the relationship between the partial pressure of O2 in the blood and the number of O2 molecules bound to Hb

Question 6

O2 saturation

Answer 6

refers to the amount of O2 bound to Hb relative to the maximum amount that can bind

Question 7

what is used to measure O2 saturation

Answer 7

pulse oximeters

Question 8

respiratory exchange ratio

Answer 8

ratio of expired CO2 to O2 uptake

Question 9

how is CO2 carried in the blood

Answer 9

dissolved
bound to Hb
as bicarbonate

Question 10

normal respiratory exchange rate

Answer 10

80 CO2 : 100 O2

Question 11

what is the equation for bicarbonate formation

Answer 11

H2O + CO2 = H2CO3 = H+ + HCO3-

Question 12

how can bicarbonate be used to stabilise pH

Answer 12

The CO2 , bicarbonate and H+ concentrations are all linked therefore changes to bicarbonate concentration can change the pH

Question 13

what shape is the oxyhemoglobin dissociation curve

Answer 13

s shaped