Because of their short lifespan, a huge number of erythrocytes are recycled by macrophages. Which of the following is NOT a function of the macrophage?
A.) The macrophage phagocytizes hemoglobin from the bloodstream.
B.) The macrophage synthesizes a small amount of hemoglobin and transports it to the bone marrow.
C.) The macrophage phagocytizes deteriorating and fragmented erythrocytes.
D.) The macrophage extracts iron from the heme portion of hemoglobin.
E.) The macrophage dismantles the globin portion of hemoglobin into individual amino acids.
Ans: B.) The macrophage synthesizes a small amount of hemoglobin and transports it to the bone marrow.
You might also like to view...
A vaccine against HIV
A. is available for those who can afford it. B. may be impossible due to the variability and diversity of HIV. C. prevents opportunistic infections. D. consists of cocktails of drugs taken daily.
Conduction by local current flow
a. occurs in unmyelinated fibers. b. is faster than propagation of an action potential in myelinated fibers because myelin acts as an insulator to slow down the impulse. c. involves current flowing locally between the active and adjacent inactive areas, thereby bringing the inactive areas to threshold so that they too become active (i.e., have an action potential). d. both (a) and (c) above. e. all of these answers.
Hypothetically, if a muscle were stretched to the point where thick and thin filaments no longer overlapped, ________
A) maximum force production would result because the muscle has a maximum range of travel B) ATP consumption would increase because the sarcomere is "trying" to contract C) no muscle tension could be generated D) cross bridge attachment would be optimum because of all the free binding sites on actin
Non-shivering thermogenesis is mediated on cold exposure by the __________ nervous system, which increases heat production by stimulating __________ fat
Fill in the blank(s) with correct word