Iron
A. prevents carbon monoxide from binding to hemoglobin.
B. is a plasma coagulation factor.
C. is the binding site for carbon dioxide on the hemoglobin molecule.
D. is needed to produce hemoglobin.
E. interferes with the normal function of hemoglobin.
Answer: D
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Which factors help to keep the articular surfaces in contact and affect range of motion?
A: structure or shape of articular bones B: strength and tension of the joint ligaments C: arrangement and tension of the muslces D: contact of soft parts E: all choices
Which of the following statements is NOT true?
a. The more complex a foreign molecule the greater its antigenicity. b. Isolated molecules may act as antigens. c. Large polysaccharides may act as antigens. d. T cells reside in colonies. e. The key to B- and T-cell specificity is the TLRs present in their membrane thatbinds antigens.
The chordae tendinae of the AV valves are anchored to the ________ of the ventricles.
A. interatrial septum B. papillary muscles C. pectinate muscles D. trabeculae carnae E. interventricular septum
The monomer of carbohydrates is a
A. amino acid. B. monosaccharide. C. fatty acid. D. nucleotide.