Adjacent cardiac muscle cells are joined together end-to-end in the ventricles by
a. intercalated discs
b. sarcomeres
c. Purkinje fibers
d. sinoatrial nodes
e. atrioventricular nodes
A
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Which of the following examples best demonstrates species resistance?
A. Certain strains of H1N1 virus infect both humans and pigs. B. A worker at an animal shelter encounters a cat with Calicivirus and infects their own cat at home after the cat is exposed to their work clothes. C. A worker at an animal shelter encounters a cat with Calicivirus, but cannot become sick with Calicivirus themselves. D. Certain strains of avian flu are transmissible between chickens, ducks, and other birds.
How many pairs of ribs are "floating ribs" that do not articulate with the sternum?
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An eyeless needle is called ____________
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