A cross-match test is performed between donor blood and recipient blood, even though the ABO and Rh blood types match between the two because
A) there are many more surface antigens on red blood cells other than A, B and Rh.
B) all antibodies of the donor blood and the recipient blood must be identified.
C) coagulation can occur even in a small percentage of cases.
D) one has to make sure that the same agglutinogens have to be on both donor and recipients red blood cells.
E) errors are commonly made by the clinical staff regarding donor-recipient matches.
A
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Ionic bonds are formed when
A) atoms share electrons. B) an electron or electrons are completely transferred from one atom to another. C) a pair of electrons is shared unequally by two atoms. D) hydrogen forms bonds with negatively charged atoms. E) two or more atoms lose electrons at the same time.
Factors that aid venous return include all except ________
A) venous valves B) activity of skeletal muscles C) pressure changes in the thorax D) urinary output
Skin color is due to
A) dermal blood supply. B) thickness of the stratum corneum. C) carotene. D) melanin. E) All of the answers are correct.
Which property of water explains its ability to prevent sudden changes in body temperature?
A) cushioning B) chemical reactant C) polarity D) high heat capacity