The Skeletal System
200
How many muscles are in the human body?
650
True or false: You have about 1 billion nerves in your body.
True
Your bones are made of this.
Calcium
The black part in the center of the eye.
Pupil
Another name for the skull.
Cranium
About _____ of your body weight comes from muscles!
The _____ is the control center of your body.
brain
The tiniest living part of the human body.
Cells
The _____ can be different colors, such as green or blue.
iris
What are animals with backbones called?
Vertebrates
Muscles that you move and control are called _____ muscles.
voluntary
If someone is _____ they are unable to move their arms and/or legs.
paralyzed
To break down food in the stomach so it can be used by your body.
Digest
True or false: The cornea is a very thick, clear tissue that covers the colored part of the eye.
False: It is very thin.
The spinal column is made up of these smaller bones that are stacked on top of each other.
Vertebrae
The _____ tendon is in the back of your leg, just above your heel.
Achilles
The _____ is the largest part of the brain.
cerebrum
The spongy inside of a bone.
Bone marrow
Vibrations in the air are called _____ _____.
sound waves
The two main bones in the human leg are called the _____ and the _____.
tibia and fibula
True or false: An involuntary muscle is a muscle that works automatically without you having to think about it.
The ____ hemisphere controls the left side of the body.
right
Another word for your shoulder blade.
Scapula
What is the smallest bone in the human body called? (Hint: It's in your ear)
stirrup