How Many Muscles Make Your Smile?: Questions About Muscles and Movement

How Many Muscles Make Your Smile?: Questions About Muscles and Movement — page 1
Why do we need muscles We need muscles to perform just about any activity that involves movement These bundles of fibrous stringy tissues do so many things They move your bones open your eyes and help you chew Many of them work automatically pumping your heart helping you digest food and making sure you breathe regularly your heart Why can you hear Each thump of your heartbeat muscle forcing a heart valve part of the heart that controls the flow of blood shut is the sound of a heart 4