We shiver when we are cold. In this process the brain plays which homeostatic role?
a. feedback system
b. sensory receptor
c. integrating center
d. effector
e. set point
ANSWER: c
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Pertussis has been making a big comeback in the last few years, after being on the decline for quite a long time. Why is this?
A. The pertussis vaccine does not seem to protect for a lifetime, so those who received the vaccine as kids may become susceptible in adulthood. B. The strain of Bordetella pertussis that is now the major cause of pertussis is much more virulent than earlier strains. C. People eat so much refined sugars and starches that our immune systems are much weaker, thereby not being able to adequately protect against pertussis bacteria. D. Few people have ever received pertussis vaccines because there have been links to autism.
Autoimmunity is typically due to
A. a deficiency in T-cell development. B. a transfusion reaction. C. graft rejection. D. IgE and mast cells. E. autoantibodies and T cells.
Which of the following is a function of the human urinary system?
A) detoxification of waste products B) elimination of undigested foods C) regulation of water content for body fluids D) production of ammonia
Which characteristic is common to all molluscs?
A) brain B) tentacles C) open circulatory system D) radula E) mantle