Self Taught? What does that mean? So I was just read a thread where programmers who were &quot;self taught&quot; were lavished with all sorts of insults and accused of heinous syntactical and documentary crimes. So what what I need to know is what is &quot;self taught&quot;? If you read a book on programming are you still self...
The heart is the key organ in the circulatory system. As a hollow, muscular pump, its main function is to propel blood throughout the body. It usually beats from 60 to 100 times per minute, but can go much faster when necessary.
Valves of the Heart. The heart functions by pumping blood both to the lungs and to the systems of the body. To prevent blood from flowing backwards or âregurgitatingâ back into the heart, a system of one-way valves are present in the heart. The heart valves can be broken down into two types: atrioventricular and semilunar valves.