Which of the following statements regarding poliomyelitis is incorrect?
A. The virus is transmitted by contaminated water.
B. Summer outbreaks in the U.S. have been increasing in frequency.
C. If the virus enters the central nervous system, motor neurons can be infected and destroyed.
D. It can be asymptomatic or mild with headache, sore throat, fever, and nausea.
E. It is caused by poliovirus (genus Enterovirus).
Answer: B
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Predict what would happen if the pulmonary vein returned blood to the right atrium.
A. The expected cardiac cycle would occur-this is the normal path. B. Abnormally high levels of oxygenated blood would be pushed into the systemic circuit. C. Oxygenated blood would be kept in a circular path between the heart and lungs-it would not reach the systemic circuit. D. Abnormally high levels of deoxygenated blood would be pushed into the systemic circuit.
Biological magnification refers to the
a. increase in size of animals as they progress through a food chain. b. increase in size of organisms as they progress through ecological succession. c. increase in the efficiency of energy utilization as organisms progress through a food chain. d. accumulation of toxic pollutants as animals pass through a food chain. e. growth of organ size within organisms.
The stapes, malleus, and ________ bones are located in the middle ear
Fill in the blank(s) with correct word
Approximately what percentage of the immune system is located in the intestinal tract?
a) 1% b) 10% c) 100% d) 70%