Each time the heart “beats,” it pushes blood in two directions at once. Some of the blood goes to the lungs, and some of the blood goes to the rest of the body. If you have ever heard a heartbeat, you know that it makes a “puh-pum” type of sound. The “puh” sound is made … Read more
The involuntary muscle movements that are continually active in our bodies is always a bit of a surprise. From focusing your eyes on this page to the journey your breakfast cereal has begun to the constant beating of your heart — aren’t we impressed with muscles! The animal kingdom had to develop some scheme to … Read more
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