Serum is essentially identical to plasma except for the absence of
platelets
fibrinogen
glucose
albumin
nitrogenous wastes
The Correct Answer is B
A. Platelets: Both serum and plasma lack platelets because platelets are cellular elements that are removed during processing.
B. Fibrinogen: Plasma contains fibrinogen (clotting factor), but during clotting fibrinogen is converted to fibrin and removed, leaving serum free of fibrinogen.
C. Glucose: Glucose is present in both plasma and serum.
D. Albumin: Albumin, the main plasma protein, is present in both plasma and serum.
E. Nitrogenous wastes: Both plasma and serum contain nitrogenous wastes (like urea, creatinine).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
A. 1: a single heme would carry one o₂, but adult hemoglobin contains more than one heme.
B. 0: hemoglobin contains heme groups (so zero is wrong).
C. 2: fetal hemoglobin and variants still have four heme groups per tetramer; two is not correct for a full hemoglobin molecule.
D. 3: hemoglobin has four globin chains and thus four heme groups, not three.
E. 4: each hemoglobin molecule has four heme groups (one per globin chain), so it can bind up to four o₂ molecules.
Correct Answer is A
Explanation
A. Produces plasma hormones: blood does not produce hormones; endocrine organs secrete hormones into the blood. This statement is not a function of blood.
B. Transports a variety of nutrients: this is a function of blood (plasma carries nutrients to tissues).
C. Helps to stabilize the pH of extracellular fluids: this is a function; blood buffers (bicarbonate, proteins) help stabilize pH.
D. Helps to regulate body temperature: this is a function; blood redistributes heat and helps maintain temperature.
E. Participates in the initiation of blood clotting: this is a function; platelets and plasma clotting factors in blood participate in clot formation.
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