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Name:__________________________ Class: 3_____-______ Homework Due Date:_____________ The Muscular System There are more than 650 muscles in the human body. Muscles are made of muscle tissue that work like the elastic material in a rubber band. Thousands or even tens of thousands, of small fibers make up each muscle. The three Types of Muscles All muscles are voluntary or involuntary. Voluntary muscles you can control. Involuntary muscles work automatically (on their own). 1. Cardiac Muscle – This is your heart muscle. It works on its own, so it is an example of an involuntary muscle. 2. Smooth Muscles –These muscles work own their own, so they are examples of involuntary muscles. Examples of smooth muscles are your stomach and intestines that help you digest your food, or the iris of your eye. 3. Skeletal Muscles – These are the muscles that attach to your bones. Tendons attach muscles to bones. When a muscle contracts it pulls on a tendon to move the bone. These are voluntary muscles. Cardiac Muscles Smooth Muscles Skeletal Muscles What would happen if your heart was a voluntary muscle? ___________________________________________________________________ ___________________________________________________________________ __________________________________________________________________. What might happen if your skeletal muscles were involuntary? ___________________________________________________________________ ___________________________________________________________________ __________________________________________________________________. 1 Homework: When you woke up this morning, what was the way you used your three different types of muscles? Write (or type) your answers using complete sentences. Cardiac muscles? __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________. Smooth muscles? __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________. Skeletal muscles? __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________. 2