Which of the following breakdown products of hemoglobin is ...

[yoroshambo]

Which of the following breakdown products of hemoglobin is removed from the body instead of being
 
  a. Globin
  b. Amino acids
  c. Protoporphyrin ring
  d. Iron

Question 2

How are normal red cells removed when they lose the ability to deform?
 
  a. After 120 days, most are phagocytized by splenic macrophages.
  b. After 10 to 14 days, most are phagocytized by splenic macrophages.
  c. After 10 to 14 days, most are destroyed by complement.
  d. After 120 days, most are destroyed inside the blood vessels.

[leeeep]

Answer to Question 1

ANS: C
The protoporphyrin ring is gradually degraded into bilirubin and eventually excreted from the body. Globin chains are broken down into their component amino acids, which are returned to the amino acid pool for future protein synthesis. Iron is very tightly conserved and recycled.

Answer to Question 2

ANS: A
At the end of their 120-day normal life span, red cells are removed from circulation by splenic macrophages.

[yoroshambo]

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