11 Biology Oxford 6.3 Carriage of respiratory gases in the blood

Oxyhaemoglobin is

• haemoglobin combined with oxygen

• haemoglobin combined with carbon dioxide

The bond between oxygen and haemoglobin is

• strong

• weak

• unbreakable

• there is no bond

The weak bond between oxygen and haemoglobin allows

• rapid attachment

• rapid detachment

In areas of the body where oxygen concentration is high (like the alveoli)

• Haemoglobin rapidly takes up oxygen

• Haemoglobin doesn't bond with oxygen

An oxygen ____ shows the % saturation of blood with oxygen at different oxygen levels

When all the haemoglobin molecules contain oxygen, the blood is

Haemoglobin

• Releases oxygen at the gas exchange surfaces

• Takes up oxygen at the gas exchange surfaces

• Releases oxygen in the tissues

• Takes up oxygen in the tissues

Increased carbon dioxide reduces how much oxygen haemoglobin can carry. This is the

Increased carbon dioxide causes haemoglobin to

• release oxygen at higher than normal oxygen tensions

• hold on to oxygen at higher than normal oxygen tensions

More oxygen is released from the haemoglobin when

• Blood is basic (higher pH)

• Blood is acidic (lower pH)

• Carbon dioxide is higher

• Carbon dioxide is lower