Each heme ring in hemoglobin encloses an atom of A magnesium

Each heme ring in hemoglobin encloses an atom of A) magnesium. B) calcium. C) iron. D) sodium. E) copper. 45. The average lifespan ofa red blood cell is A) 24 hours. B) l month. D) about 1 year. E) many years. 46. The process of red blood cell production is called A) erythrocytosis. B) erythropoiesis. C) hemocytosis. D) erythropenia. E hematopenia. 47. People with t AB blood are considered the \"universal recipient\" for transfusions because A) their blood cells lack A and B antigens. B) their blood lacks A or B antibodies D) they usually have very strong immune systems. 48. If the blood types of a donor and recipient are compatible, then A) the donor\'s antibodies bind with the recipient\'s antigens. B) the donor\'s antigens bind with the recipient\'s antigens. D) there is no reaction between antibodies and antigens.

Solution

44.Each heme ring in hemoglobin encloses an atom of

ANS--(C): Iron

45.The average lifespan of a red blood cell is

ANS--(C): 4 months

46.The process of red blood cell production is called

ANS--(B):erthropoiesis

47.People with type AB blood are considered the \"universal recipient\" for transfusions because

ANS--(B):Their blood lacks A or B antibodies

48.ANS--(c)