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Strongest Muscle (Grade 3)

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Strongest Muscle

What's the strongest muscle in the human body? That question is actually difficult to answer.

The human body has three different kinds of muscles (cardiac, skeletal, and smooth) and there are hundreds of muscles in the body. Each muscle works to help make the body strong as a whole. However, there are a few muscles that do more work than many of the others.

Eye Muscles
The muscles in your eyes, particularly the muscles on the outside of your eyes do a lot of work. These external muscles help your eye adjust its position so it can keep a steady gaze. They can move over 10,000 times in an hour. That's a lot of work!

Gluteus Maximus
The gluteus maximus is a large muscle. In fact, it's the largest in your body. It helps to keep your body upright and controls your posture. It also works against gravity, which means it has to be very strong.

Many people think the heart is your strongest muscle because it works the hardest. Your heart pumps blood 24 hours a day. During your lifetime, it can beat over 3 billion times. It's what helps keep you alive.

The masseter is a muscle in your jaw. It helps you close your teeth with tremendous force.

Below your calf muscle is your soleus. This muscle helps you walk, run, and dance. It works against gravity to help you stand up and requires a lot of strength to keep you moving.

Your tongue is always at work, even when you think it's not. Your tongue is actually a group of muscles. It helps you speak, it helps you process foods, and all day long it helps move saliva around in your mouth and down your throat.

All of the muscles in your body work very hard to help make sure everything runs smoothly. Which muscle do you think is the strongest of them all?
The author gives a clear answer to the question asked at the beginning.
  1. True
  2. False
Which detail best explains why your eye muscles can move nearly 10,000 times in an hour?
  1. The muscles must keep moving to help keep the picture in focus.
  2. The muscles must keep moving to help keep your eyes moist.
  3. The muscles must keep moving to help your eyes blink.
  4. The muscles must keep moving to help keep your reflexes strong.
According to the author, which muscle works the hardest?
  1. The gluteus maximus
  2. The masseter
  3. The heart
  4. The eye muscle
The author says there are hundreds of muscles in the human body.
Why did the author decide to write about the muscles in this passage?
  1. They are the muscles with easiest names to pronounce.
  2. They are the muscles that do more work than others.
  3. They are the muscles that are most easy to see.
  4. They are the muscles that are most popular.
The author says there are three types of muscles: heart, skeletal, and smooth.
Cardiac muscles are related to the heart, skeletal muscles give your body power and strength, and smooth muscles are involuntary muscles that are always working behind the scenes.

Based on these descriptions, eye muscles are most likely...
  1. cardiac muscles
  2. skeletal muscles
  3. smooth muscles
  4. special muscles

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