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Muscular System

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Designed By:
Christian Alas
Created and illustrated By:
Angelo Romero and Camilo Sanabria

Muscular System

The muscular system is made up of groups of tissues called muscles. The muscular system works together with the skeletal system to enable our bodies to move. There are two types of muscle groups in our bodies.

There are voluntary muscles and involuntary muscles. The muscles that we can control when we want to use them are called voluntary muscles. The muscles in your arms and legs are voluntary because we control when we want to move them.

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The muscles that work even when we don’t know it and are not controlled by us are called involuntary muscles. Muscles in your stomach, heart and other organs are involuntary muscles because they work on their own without us controlling them.

There are three types of muscle tissues in the muscular system. These types are skeletal muscles, smooth muscles, and cardiac muscles. Skeletal muscles are the muscles that allow the body to move. Smooth muscles are involuntary muscles and are found inside organs like the stomach. Cardiac muscles are the muscles that are located in the heart. Cardiac muscles are involuntary.

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Some of your major arm muscles are your biceps, triceps and deltoids. The pectoralis muscles make up your chest muscles. The quadriceps are your thigh muscles. Muscles are very important to our bodies and especially to our ability to move.

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READING QUESTIONS

1. What is the writer’s main idea?

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2. What example supports the writer’s main idea?

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3. How does the example help the writer’s argument?

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4. What do you think about the story?

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