What was the circulatory system before the XNUMXth century? Detailed answer

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What was the circulatory system before the XNUMXth century? Detailed answer

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What was the circulatory system before the XNUMXth century?

Until 1628, when the book Anatomical Study of the Movement of the Heart and Blood in Animals by the English physician William Harvey was published, it was believed that blood pumped back and forth in the vessels, moving first in one direction, then in the opposite direction.

This point of view has dominated since the time of the Roman physician and anatomist Claudius Galen (about 130 - about 200), who thus tried to explain why the movement of blood through the vessels is not blocked by partitions between the two halves of the heart.

William Harvey was the first to establish that the two chambers of each half of the heart are separated by a valve that allows blood to flow in only one direction - from the upper chamber (atrium) to the lower chamber (ventricle). In other words, in the right and left halves of the heart, blood, entering the atrium, is pumped into the ventricle, from which it already exits into the vessels. Blood cannot move in the opposite direction.

William Harvey's book provoked fierce attacks from contemporary scholars and the church.

Author: Kondrashov A.P.

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What gesture, familiar to us, is also a symbol of the gay people of San Francisco?

There are several versions of the origin of the "High five" gesture ("Give five!"), But the most common one indicates its first appearance in a baseball game on October 2, 1977. Los Angeles Dodgers players Dusty Baker and Glenn Burke played a good combination, after which Burke enthusiastically raised his hand above his head. Not knowing what to do, Baker slapped him with his hand. Three years later, Burke, an open homosexual, was forced to retire from baseball, but this gesture was not forgotten. He popularized it in the Castro neighborhood of San Francisco, known for being densely populated by gay minorities, where "High five" became a symbol of gay self-identification.

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