First of all, a pig heart is fairly easy to acquire. Pig
hearts are also fairly similar to human hearts. The are approximately the same size,
they both have four chambers, and they both have the same approximate pumping
capacity.
Since students (unless they are medical students)
do not generally have access to a human heart, the next best thing is used, the pig
heart. Examining a pigs heart can give students the opportunity to get a good look at
how the heart actually works. Some students do refuse to participate in these
experiments because they feel it is unethical. Usually an alternate assignment is
given.
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