The folds in the lining of the stomach are called:
A) chyme.
B) rugae.
C) fundus.
D) sphincters.
B) rugae.
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Which of the following is the BEST example of herd immunity?
A. A child infected with measles travels from Germany to the United States. Several babies contract the disease, but the outbreak is largely contained due to vaccinations. B. Certain populations of cattle are less susceptible to infection with encephalitis because of their genetic makeup. C. Once a certain threshold of individuals has been infected with a novel human pathogen, it is unlikely that any more will be. D. Geese and chickens are infected with different strains of influenza because they express different receptors on their cell surface. E. When infection spreads through a population, certain individuals generate stronger immune responses than others.
Which directional term refers to the tip or summit of an organ?
A) medial B) lateral C) base D) apex
Which of the following conditions is the temporary or permanent loss of muscle function?
a. concussion b. paralysis c. migraine d. myasthenia gravis
Data published in 2013 indicated that between 40 percent and 80 percent of long-term back pain due to a herniated or slipped disk may be related to ____
a. an abnormal curvature of the spine b. arthritis c. a bacterial infection caused by Propionibacterium acnes d. genetic factors e. gender differences