It is when a muscle gets shorter and pulls a bone.
contract
It is when a muscle get longer or returns to its normal size.
relax
Muscles allow us to ______.
move
Animals with no skeleton are called ____________.
invertebrates
It is a hard, strong frame that supports our bodies.
skeleton
A drug that makes our bodies better when we are sick.
medicine
_________ are substances that change our bodies in some way. Many of these have good effects but some can have bad effects to our bodies.
drugs
(True or False) Not all drugs are medicines.
True
(True or False) Medicines are the same as drugs.
False
Which part of our skeleton protect the heart and lungs?
The ribs.
Who has more bones, a baby or an adult? Why?
A baby has more bones because as the baby grows, some of its bones join together.
Why is the skull an important part of our skeleton?
The skull is important because it protects our brain.
How do our muscles work?
Muscles work in pairs. When one muscle contracts the other muscle relaxes.
