Which of the following is not a function of blood?
Produces plasma hormones
Transports a variety of nutrients
Helps to stabilize the pH of extracellular fluids
Helps to regulate body temperature
Participates in the initiation of blood clotting
The Correct Answer is A
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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Related Questions
Correct Answer is C
Explanation
A. Insulin: insulin is a low-concentration peptide hormone (produced by pancreas), not the major plasma protein.
B. Bilirubin: bilirubin is a breakdown product of heme (not a protein) and is present in low concentrations.
C. Albumin: albumin is the most abundant plasma protein (produced by the liver); it maintains oncotic pressure and binds/ transports many substances.
D. Creatinine: creatinine is a small waste molecule (not a protein) present at low concentration.
E. Creatine: creatine is a small molecule involved in muscle energy storage, not a plasma protein.
Correct Answer is A
Explanation
A. anti-B antibodies in the recipient will agglutinate RBCs of the donor: A recipient with type A blood has anti-B antibodies in their plasma; those antibodies will react with the donor’s B antigens on AB RBCs causing agglutination/hemolysis.
B. anti-D antibodies in the donor will agglutinate RBC of the recipient: The donor is Rh-negative and therefore does not have D antigen or anti-D on their RBCs; donor plasma rarely contains anti-D in this context and donor RBCs cannot agglutinate recipient RBCs.
C. anti-A antibodies in the donor will agglutinate RBCs of the recipient: An AB donor does not have anti-A (or anti-B) antibodies in their plasma; moreover transfused RBCs (not donor plasma) are the main concern.
D. anti-B antibodies in the donor will agglutinate RBCs of the recipient: An AB donor has no anti-B antibodies; even if present, donor anti-B would act on recipient B antigens (which A recipient lacks), so this statement is wrong.
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