Abnormal red blood cell counts have what consequences on health?
Altered oxygen-carrying capability of blood
Altered ability to clot blood
Altered ability to fight infection
Altered heart rate and contractility
The Correct Answer is A
A. Altered oxygen-carrying capability of blood: RBCs (via hemoglobin) are the primary carriers of oxygen; too few (anemia) or dysfunctional RBCs reduce O₂ delivery, too many (polycythemia) can alter flow.
B. Altered ability to clot blood: clotting is primarily mediated by platelets and clotting factors, not by RBC count (RBCs can influence viscosity but are not the main clotting elements).
C. Altered ability to fight infection: fighting infection is mainly the role of leukocytes (WBCs), not RBCs.
D. Altered heart rate and contractility: significant changes in RBC number (especially anemia) can cause compensatory increases in heart rate and contractility to maintain oxygen delivery; polycythemia can also change cardiac workload.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Bound to the globin portion of hemoglobin: Oxygen binds the heme (iron) portion, not the globin protein chains
B. Dissolved in the plasma: Only a small fraction (~1.5%) of O₂ is dissolved in plasma
C. Bound to the heme portion of hemoglobin: Most O₂ (~98–99%) is carried as oxyhemoglobin bound to heme iron
D. In the form of bicarbonate and water: Bicarbonate transport applies to CO₂, not O₂
Correct Answer is C
Explanation
A. Bronchomediastinal duct and subclavian duct: bronchomediastinal and subclavian are lymphatic trunks, not the two major collecting ducts.
B. Right and left thoracic ducts: there is a single thoracic duct (left-sided) and a separate right lymphatic duct; we do not have distinct “right and left thoracic ducts.”
C. Thoracic duct and right lymphatic duct: the thoracic duct drains most of the body into the left subclavian vein, and the right lymphatic duct drains the right head/neck, right upper limb, and right thorax into the right subclavian vein.
D. Lumbar duct and left lymphatic duct: “lumbar duct” is not a collecting duct term used in this context, and “left lymphatic duct” is another name sometimes used for the thoracic duct but paired with “lumbar duct” is not the standard two-collector pair.
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