Author Question: Which of the following is true of the oxygen dissociation curve? a. The normal partial pressure ... (Read 208 times)

Hungry! · **on:** Jun 25, 2018

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

a. The normal partial pressure of oxygen (PO2) at which hemoglobin is 50 saturated is 20 mm Hg.
b. A shift to the right or left in response to blood pH is called the Bohr effect.
c. A shift to the left results in lower oxygen affinity.
d. A shift to the right results in less effective delivery of oxygen to tissue.

Question 2

The reference range for hemoglobin concentration:

a. Is lower in a newborn than in a male adult
b. Is lower in a newborn than in a female adult
c. Is higher in a newborn than in a male adult
d. Is higher in a woman than in a man

peilian · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

ANS: B
The Bohr effect describes the shift in position of the oxygen dissociation curve in response to blood pH; a decrease in pH (acidosis) shifts the curve to the right and results in a decreased oxygen affinity and more effective oxygen delivery. A decrease in pH (alkalosis) is the reverse: the curve shifts to the left resulting in increased oxygen affinity and less effective delivery of oxygen to tissue.

Answer to Question 2

ANS: C
The reference range for hemoglobin concentration is higher in a newborn than in either an adult man or woman. In adults, it is higher in men than in women.