oxygen dissociation curve

What is the primary role of hemoglobin in the mammalian circulatory system?

• To transport carbon dioxide

• To transport oxygen

• To fight infections

• To clot blood

How many molecules of oxygen can one molecule of hemoglobin combine with?

• Four

• Three

• Two

• One

What is the shape of the oxygen dissociation curve?

• Linear

• Exponential

• Sigmoid

• Hyperbolic

What adaptation do erythrocytes have for transporting oxygen?

• Lack of mitochondria

• Presence of a nucleus

• Ability to divide

• Biconcave structure

What happens to hemoglobin when it binds to oxygen?

• It becomes oxyhemoglobin

• It becomes deoxyhemoglobin

• It disintegrates

• It becomes carbonic anhydrase

At what partial pressure of oxygen is hemoglobin 25% saturated?

• Around 8 kilopascals

• Around 6 kilopascals

• Around 4 kilopascals

• Around 2 kilopascals

What effect describes the increased affinity of hemoglobin for oxygen after one oxygen molecule binds?

• Allosteric inhibition

• Lock and key mechanism

• Positive cooperativity

• Negative feedback

What is the saturation level of hemoglobin in the alveoli?

• Around 100%

• Around 97%

• Around 85%

• Around 75%

What causes the quaternary structure of hemoglobin to change?

• Binding of oxygen

• Both binding and loss of oxygen

• Binding of carbon dioxide

• Loss of oxygen

What is the consequence of the quaternary structure change in hemoglobin?

• Increases oxygen affinity

• Decreases oxygen affinity

• No change in oxygen affinity

• Increases carbon dioxide affinity