Year 3 Revision Bones and Muscles

Scientists group living things based on their features. The animals in the diagram have been grouped based on whether or not they.

• have skeletons inside their bodies.

• are animals or insects.

Is slug a vertebrate or invertebrate?

• Vertebrate

• Invertebrate

Which of these animals are vertebrates?

• Koala

• Caterpillar

• Elephant

• Ladybird

• Butterfly

Which diagram shows the skeleton of a human?

• A

• B

• C

• D

Human babies have 300 bones. Adult humans have 206 bones. What happens to the extra bones as the baby grows up?

• Some bones fuse to form larger bones

• Some bones break

• Some bones fall off

___________ relax and contract to move our bones.

• Skeleton

• Muscles

• Organs

• Joints

A _________ muscle gets shorter and pulls on the bone to move it.

• Contracting

• Relaxing

When muscles _ _ _ _ _, they go back to their normal size and stop pulling on the bone.

• Contract

• Relax