Bones and Muscles | Introduction
Introduction
Whenever you run, sit, walk, or even stand, your bones and muscles are working together in the activity. Bones are similar to the framework of a building; they provide the shape and protection. Our bones also produce our much-needed supply of daily blood cells—about 200 billion a day! They are the holding places for minerals and other key substances the body needs.
Many muscles are attached to bones and they pull the bones for movement. Other muscles provide much-needed functions for daily life. Even when you are just sitting still, your muscles are at work. They are allowing you to breath, swallow, smile, and even move your eyes. And it is a muscle that powers your entire body—the heart muscle. Working nonstop through a person's life, this vital muscle beats an average of seventy times per minute.