Iron is a component of what substance?
Biliverdin
Heme
Bilirubin
Globin
The Correct Answer is B
A. Biliverdin: biliverdin is a green pigment formed during heme breakdown and does not contain iron.
B. Heme: the heme moiety of hemoglobin contains an iron atom (Fe²⁺) at its center that binds oxygen.
C. Bilirubin: bilirubin is a breakdown product of biliverdin and does not contain iron.
D. Globin: globin is the protein part of hemoglobin (amino-acid chains); iron is in the heme portion, not the globin polypeptide.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"B"}
Explanation
A. Microvilli: Microvilli increase surface area for absorption (common in intestines), not the hallmark of respiratory epithelium
B. Cilia: Respiratory epithelium (pseudostratified ciliated columnar) is equipped with cilia on its free surface to move mucus and trapped particles
C. Keratin: Keratinization occurs in skin epithelium (protective), not in the typical respiratory lining
D. Desmosomes: Desmosomes are cell junctions found in many epithelia but the question asks about free-surface specializations; cilia are the functional free-surface structures in respiratory epithelium
Correct Answer is B
Explanation
A. pressure of the blood: Not primarily—systemic blood pressure is mainly from cardiac output and vascular resistance; proteins contribute minimally.
B. osmotic: Plasma proteins (especially albumin) generate colloid osmotic/oncotic pressure that pulls fluid into capillaries.
C. filtration: They oppose filtration by favoring reabsorption (their oncotic pull counters hydrostatic push).
D. central venous: CVP reflects blood volume, venous tone, and right heart function, not plasma protein levels directly.
E. hydrostatic: Hydrostatic pressure is due to fluid column and pumping; proteins affect oncotic, not hydrostatic, pressure.
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