When he discovered that blood is pumped from the heart to the body, and back to the heart, had a difficult time getting people to accept his discovery because it went against the ancient teachings of .

1. William Harvey

2. Anatomy

Explanation:

1 - William Harvey

2 - Galen

Explanation:

Galen, who postulated that blood was produced continuously in the liver and absorbed by the body (not recirculated), served as the Roman emperor's personal physician. For 1500 years, his theories about human anatomy went unquestioned until Harvey's proposal in 1628.

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