Narrowing of the aortic valve in the heart.
The aortic valve controls blood flow from the left ventricle to the aorta and the rest of the body. It opens when the ventricle contracts and closes when the ventricle relaxes.
Our hearts are vital pumps. Just like any pump they work best at the pressures for which they are designed. But unlike most mechanical... Read more »
Just half a century ago, if you wanted to look at a medical textbook, you would have to go to the library and ask for special permission.... Read more »