8.4 Transport Of O2 And Co2 In The Blood

Question 1

How is CO2 transported out of the body ?

Answer 1

• 5% is dissolved directly in the blood plasma
• 10% is combined with haemoglobin to form carbaminohaemoglobin
• 85% is transported as hydrogen carbonate ions (HCO3-)

Question 2

What is the equation for haemoglobin combining with oxygen?

Answer 2

Hb + 4O2 <===> Hb(O2)4

Question 3

What does affinity for oxygen mean ?

Answer 3

• the tendency to combine with oxygen

Question 4

What is another name for red blood cells?

Answer 4

Erythrocytes

Question 5

What happens in the lung ?

Answer 5

• Oxygen joins to the iron in haemoglobin and forms oxyhaemoglobin
• (reversible reaction) when oxygen leaves , oxyhemoglobin dissociates from it near the body cells , it turns back to haemoglobin

Question 6

In the dissociation curve graph what happens when high partial pressure of O2 ?

Answer 6

• HIGHEST percent of saturation .
• All haemoglobin is associated with oxygen
• e.g in the lungs

Question 7

In the dissociation curve graph what happens when medium partial pressure of O2 ?

Answer 7

• Most haemoglobin is still found as oxyhemoglobin

Question 8

In the dissociation curve graph what happens when low partial pressure of O2 ?

Answer 8

• LOW percent saturation
• e.g in the body tissues
  -oxyhemoglobin dissociates

Question 9

Oxygen _____ ______ haemoglobin to form oxyhemoglobin where there is a ____ .
Oxyheamoglobin _______ its oxygen where there is _____ .

Answer 9

• loads onto….. higher pO2
• unloads ….. lower pO2

Question 10

What does a 100% saturation means ?

Answer 10

• Every haemoglobin molecule is carrying the maximum of 4 molecules of oxygen.

Question 11

What is the BOHR effect ?

Answer 11

The effect on carbon dioxide on oxygen affinity of haemoglobin.