Oxyhaemoglobin dissociation curve

Why is there a decrease in the percentage saturation of oxygen in haemoglobin when the blood reaches the tissues.

• Oxygen is taken up by the muscles

• Myoglobin takes the oxygen as it has a higher affinity for it

• Oxygen escapes over time

• The hemoglobin is destroyed

What is the name, and which direction does it move in comparison to the line at rest, of the line on the graph which represents a person during exercise?

• The Muhr shift to the left

• The Hodr shift to the right

• The Bohr shift to the right

• The Bofr shift to the bottom

Why does more carbon dioxide in the blood produced by exercise cause more haemoglobin to get rid of oxygen quicker?

• As it is bad for the haemoglobin.

• As chemoreceptors detect the increase in carbon dioxide and which causes the heart to speed up, so more oxygen is transported around the body.

• As it decreases the diffusion gradient of oxygen, which is required by the muscles to respire. Hence more oxygen is needed to maintain the gradient.

What are the 2 pH's for both lines on the graph?

• 7.4, 6.8

• 7.5, 7.2

• 7.4, 7.2

• 7.2, 6.8

True or false, the pH level of the blood affects the curve

• True

• Fasle