How many heme groups are required to synthesize 4 hemoglobin molecules?

Which antigens does a person with blood type A− have on the surface of his or her erythrocytes?

a. A antigens

b. B antigens

c. Rh antigens

d. Both a and c are correct.

e. All of the above

Predict the effects of each of the following on systemic arterial blood pressure:

a. The practice of 'blood doping,' which increases the number of red blood cells in the blood

Why is it important for erythrocytes to have a high surface area to volume ratio?

Cynthia lives in Miami, a city at low altitude. She goes on a month-long trip to the Andes Mountain range (at high altitude) where the air pressure is lower and therefore there is less oxygen in each breath she takes. Upon returning to Miami, how might a sample of her blood differ from a sample taken before she left for her trip?

Anemia is a blood disorder where the $O_2$-carrying capacity of blood is too low to support the body's tissues. Which of the following is not a possible cause of anemia?

Anemia is defined as:

a. a decreased oxygen-carrying capacity of the blood.

b. a decreased iron content of the blood.

c. decreased bone marrow function.

d. abnormalities in hemoglobin.