What is a function of the pulmonary circuit?
It carries oxygen-poor blood to the tissues.
It carries oxygen-poor blood to the heart.
It carries oxygen-poor blood from the tissues.
It carries oxygen-poor blood to the lungs.
The Correct Answer is D
A. It carries oxygen-poor blood to the tissues: That’s the systemic circuit's function (to deliver oxygen to tissues via arterial blood), so incorrect.
B. It carries oxygen-poor blood to the heart: Venous return from tissues brings oxygen-poor blood back to the heart, but the pulmonary circuit specifically moves blood from the heart to the lungs -so this is misleading/incorrect.
C. It carries oxygen-poor blood from the tissues: The systemic veins do that; the pulmonary circuit carries blood from the heart to the lungs, not directly from tissues.
D. It carries oxygen-poor blood to the lungs: Pulmonary circuit transports deoxygenated blood from the right ventricle to the lungs for oxygenation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
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.
Correct Answer is A
Explanation
A. Macrophages -Alveolar macrophages (dust cells) engulf debris, dust, and pathogens.
B. Surfactant -Surfactant reduces surface tension, preventing alveolar collapse, but does not remove particles.
C. Antibodies -Antibodies neutralize pathogens but do not actively remove inhaled particles.
D. Lymphocytes -Lymphocytes mediate immune responses but are not the main mechanism for clearing inhaled debris.
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