Which tunic of an artery is most responsible for maintaining blood pressure and continuous blood circulation?
A) tunica externa
B) tunica adventitia
C) tunica media
D) tunica intima
C
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The composition of lymph is most similar to
A. whole blood. B. extracellular fluid. C. intracellular fluid. D. interstitial fluid. E. blood plasma.
What is the major advantage of the adaptive immune system?
A) The intensity of the immune response is decreased when a foreign agent is detected a second time because the immune system recognizes the foreign agent from a previous encounter. B) It has higher specificity than the innate system because it can identify which immune cells produce the correct antibodies and amplify those cells. C) All features of the adaptive immune system are the same in all vertebrates. D) A and B are equally advantageous.
Which of the following statements is true about teeth?
A. The primary component of teeth is dentin. B. The outer surface of enamel forms the crown of a tooth. C. The root is covered by cementum. D. All of the choices are correct.
What is the process by which the eye lens changes shape to focus light on the retina?
A) accommodation B) astigmatism C) visual acuity D) none of the above