Oxygen Dissociation Curve

Which of the following is true about the plot of the oxygen dissociation curve?

• The partial pressure of oxygen is on the y axis, and the partial pressure of haemoglobin is on the x axis
• The partial pressure of oxygen is on the x axis and the partial pressure of haemoglobin on the y axis
• The partial pressure of oxygen is on the x axis and the percentage saturation of haemoglobin is on the y axis
• The partial pressure of oxygen is on the x axis and the percentage saturation of oxygen is on the y axis

With reference to the graph, which of the areas represent the percentage saturation in a resting muscle tissue?

• A and C

• A alone

• B and C

• B alone

Which of the following is true about percentage saturation of blood in region C

• That is the percentage saturation of blood that is entering the lungs

• That is the percentage saturation of blood leaving the lungs

• That is the percentage saturation of the alveolar air space

• That is the percentage saturation of the plasma

Tags

NGSS.HS-LS1-7

Using the graph, what does graph A represent?

• graph of fetal haemoglobin

• graph of sickle celled haemoglobin

• graph of adult haemoglobin

• graph of denatured haemoglobin

Which statement truly represents the difference between the two curves?

• Curve A represents an haemoglobin that has higher affinity for oxygen at all partial pressures of oxygen

• Curve A represents a curve that has higher affinity for haemobloby at only at low partial pressures of oxygen

• Curve A represents haemoglobin that will readily release oxygen at all partial pressures

• Curve A represents haemoglobin that will not readily bind to oxygen even at high partial pressure of oxygen

Which of the following statements is true from the curve?

• any decrease in partial pressure will always cause curve A's haemoglobin to release more oxygen

• any decrease in partial pressure will always cause curve B's haemoglobin to release more oxygen

• any decrease in partial pressure will only cause curve A's haemoglobin to release more oxygen at low partial pressures of oxygen

• any decrease in partial pressure will only cause curve A's haemoglobin to release more oxygen at high partial pressures of oxygen

At which range of partial pressure will both haemoglobin have the same percentage saturation?

• 90mmHg - 100mmHg

• 60mmHg - 100mmHg

• 60mmHg - 100 mmHg

• 80mmHg - 100mmHg

Using the graph, which of the following is true about myoglobin?

• it is proteinous in nature

• it does not readily release its oxygen until partial pressure of oxygen starts falling below 40mmHg

• it only releases it's oxygen when haemoglobin has released all its oxygen

• compared to adult haemoglobin, it releases more oxygen when partial pressure reduces from 60mmHg to 30mmHg

Under which range of partial pressure decrease will myoglobin release more oxygen than adult hemoglobin?

• decrease from 15mmHg to 5mmHg

• decrease from 40mmHg to 20mmHg

• decrease from 80mmHg to 20mmHg

• decrease from 100mmHg to 20mmHg

At partial pressure of 20mmHg, ………………………

• Adult haemoglobin has a higher affinity for oxygen than myoglobin

• Adult haemoglobin is less saturated with oxygen compared to myoglobin

• Adult haemoglobin is completely deoxygenated while myoglobin is not

• Adult haemoglobin still has capacity to release a large amount of oxygen compared to myoglobin