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Story Questions

1. 
   What could be a different title for this passage?
   
   1. 
      “Blood in the Body” c. “How the Circulatory System Works”
      
   2. 
      “The Heart and Lungs” d. “Arteries and Veins in the Body”
      
2. 
   Which of the following is not a fact about the circulatory system?
   
   1. 
      The heart beats about 3 billion times in the average lifetime.
      
   2. 
      The blood contains oxygen for the brain.
      
   3. 
      The blood returns to the heart through the veins.
      
   4. 
      The brain helps the body move and have feelings.
      
3. 
   What was meant by the use of the words “active role” in the first paragraph?
   
   1. 
      Without the heart, the body would die.
      
   2. 
      The brain, heart, and lungs are connected.
      
   3. 
      The brain, heart, and lungs play an important role.
      
   4. 
      The heart, lungs, and blood vessels work together to get blood flowing through the body.
      
4. 
   How did the stethoscope help doctors learn more about the heart?
   
   1. 
      They could hear the heart at work.
      
   2. 
      They could use the stethoscope to measure the amount of blood flow.
      
   3. 
      They could use the stethoscope to hear if a person has a heart or not.
      

THE Muscular System

We all use our muscles to move our bodies. Without muscles, you would not be able to talk, eat, walk, sleep, or move at all. There are over 650 muscles that your body uses. These muscles are attached to the skeleton.

There are three types of muscles. They are the skeletal muscles, the cardiac muscles, and the smooth muscles. All of these muscles can tighten.

Some of these are voluntary muscles, and others are involuntary muscles. Voluntary muscles move only when we think about it. The muscles in our arms and legs work like this.

Involuntary muscles move when we aren’t even thinking about it. The heart is an example of an involuntary muscle. If we had to think about it to make our heart beat, we might forget.