70. What is true of myoglobin? A) It has a higher oxygen affinity at low partial

Question

70. What is true of myoglobin? A) It has a higher oxygen affinity at low partial pressures of oxygen. B) It is pH-sensitive. C) It has four iron polypeptide D) E) chains It is found in blood All of the above 71. Which vessels return deoxygenated blood to the heart? A) Veins B) Arteries C) Capillaries D) Vessels E) Coronary artery 72. Thrombin promotes the conversion of into fibrin A) Fibrinogen B) Prothrombin C) Profibrin D) Plasma E) none of the above 73. The O; content of blood heading toward working muscle is compared to that of blood circulating toward the lungs A) higher B) lower C) the same D) not relevant 4. What's one thing that can increase blood flow? A) Release of nitric oxide that constrict B) Release of nitric oxide that relaxes C) Release of carbon dioxide that D) Release of carbon dioxide that E) Release of hydrogen sulfide that blood vessels smooth muscle of arteries relaxes smooth muscle of arteries constricts blood vessels assists in pumping heart 5. Which is least likely about arteries? A) Thick walls B) Carries blood away from the heart C) Branches off into arterioles D) Mainly carries O E) Has valves IMUNITY 76-90 s. How can a pathogen evolve to avoid detection by immune system B-cells? A) They can change their surface protein to become unrecognizable. B) They can evolve faster through shorter generation time. C) They can hide inside body cells D) All of the above E) None of the above

Explanation / Answer

70. A

71. A veins

72.A. fibronigen

73. D. Not relevant

75. E. Valves

76. D. All of the above

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