Respiratory

Which of the following is the correct definition of the oxyhemoglobin dissociation curve?

• The oxyhemoglobin dissociation curve is a graph that shows the relationship between the partial pressure of oxygen (PO2) and the saturation of hemoglobin with oxygen (SO2).
• The oxyhemoglobin dissociation curve is a graph that shows the relationship between the partial pressure of oxygen (PO2) and the pH of the blood.
• The oxyhemoglobin dissociation curve is a graph that shows the relationship between the partial pressure of oxygen (PO2) and the concentration of hemoglobin in the blood.
• The oxyhemoglobin dissociation curve is a graph that shows the relationship between the partial pressure of carbon dioxide (PCO2) and the saturation of hemoglobin with oxygen (SO2).

How is most oxygen carried in the blood?

• Red blood cells, bound to hemoglobin

• Dissolved in plasma

• Platelets
• White blood cells

How is most carbon dioxide transported from tissues to the lungs?

• Oxygen molecules (O2)
• Dissolved in plasma

• Bicarbonate ions (HCO3-)
• Water molecules

What is the correct definition of Dalton's Law?

• Dalton's Law states that the total pressure exerted by a mixture of non-reacting gases is equal to the product of the partial pressures of the individual gases.
• The total pressure exerted by a mixture of non-reacting gases is equal to the average of the partial pressures of the individual gases.
• Dalton's Law states that the total pressure exerted by a mixture of non-reacting gases is equal to the difference of the partial pressures of the individual gases.
• The total pressure exerted by a mixture of non-reacting gases is equal to the sum of the partial pressures of the individual gases.

What drives air moving into the lungs?

• Contraction of the diaphragm and intercostal muscles
• Relaxation of the diaphragm and intercostal muscles
• Contraction of the abdominal muscles
• Expansion of the rib cage

Which of the following are characteristics that favor gas exchange in the lungs?

• small surface area, thick respiratory membrane, poor blood supply

• large surface area, thin respiratory membrane, good blood supply

• large surface area, thick respiratory membrane, poor blood supply

• small surface area, thin respiratory membrane, poor blood supply

What drives gas exchange?

• Difference in partial pressure of gases
• Difference in humidity
• Difference in concentration of gases
• Difference in temperature

At what structure in the lungs does gas exchange occur?

• alveoli
• diaphragm
• trachea
• bronchi

What shifts the oxyhemoglobin dissociation curve left?

• Decrease in temperature, decrease in carbon dioxide levels, increase in pH (alkalosis

• Decrease in temperature, increase in carbon dioxide levels, decrease in pH (acidosis)

• Increase in temperature, increase in carbon dioxide levels, decrease in pH (acidosis)

• Increase in temperature, decrease in carbon dioxide levels, increase in pH (alkalosis)