8.4 Transport Of Oxygen And Carbon Dioxide In The Blood

Question 1

Haemoglobin

Answer 1

Large globular protein made of 4 peptide chains. Red pigment carrying oxygen.

Question 2

Oxyhaemoglobin

Answer 2

Binding of oxygen and haemoglobin. Reversible reaction

Question 3

Positive cooperativity

Answer 3

Arrangement of haemoglobin molecule allowing molecule to change shape as soon as one oxygen molecule binds to a haem group, making it easier for the next oxygen molecules to bind

Question 4

Oxygen disassociation curve

Answer 4

Tool to help understand how blood carries and releases oxygen. Shows affinity of haemoglobin for oxygen

Question 5

Bohr effect

Answer 5

As partial pressure of CO² rises, haemoglobin gives up oxygen more easily.

Question 6

Partial pressure

Answer 6

Pressure exerted by a single component in a mixture of gases

Question 7

Fetal haemoglobin

Answer 7

Higher affinity for oxygen than the adult haemoglobin in the mother. Removes oxygen from the maternal blood as they pass each other.

Question 8

C0² transport methods

Answer 8

5% dissolved in plasma. 10-20% combined with amino groups in polypeptide chains of haemoglobin. 75-85% converted into hydrogen carbonate in erythrocyte cytoplasm

Question 9

Carbonic anhydrase

Answer 9

Enzyme catalysing reversible reaction between C0² and water to form carbonic acid.