Page 43 - Active Science 5 Ebook and Activity

LET’S
REVISE

• Skeletal system gives shape and support to the body.
• The skull, spine, ribcage, limbs are parts of the skeleton.
• Bones are hard on the outside, and inside they contain a soft and spongy matter called the
bone marrow.

• Joints help the bones to move.
• The fingers have three bones each, while the thumb has two bones.
• The nervous system controls all the systems of the body, using brain, nerves and spinal cord.

• Reflex actions are automatic actions of the body which are controlled by the spinal cord.
• We get information about our surroundings through sense organs– eyes, ears, nose, tongue
and skin.
• Medulla controls the heartbeat, breathing and swallowing.

Let’s Pronounce Together

skeletal vertebral column sternum humerus femur cartilage
vertebrae striated cerebrum cerebellum medulla pinna
auditory palate epidermis hypodermis

Glossary

• Brain : The control centre of the body.
• Tendons : Tissues which help the muscles to attach to the bones.

• Reflex action : An involuntary action in response to a stimulus.
• Joint : A place where two bones meet.
• Taste buds : Tiny receptors on the surface of the tongue that help us to
detect various tastes.
• Vertebrae : Small bones containing tiny holes which make up the backbone.
• Voluntary muscles : The muscles which are under our control, e.g. hand and leg
muscles.
• Motor nerves : The motor nerves carry messages from the brain or spinal cord
to the muscles.
• Cerebrum : The largest part of the brain that controls the ability to think,
learn, decide and feel.
• Cerebellum : The part of the brain which coordinates all the voluntary
movements.
• Medulla : The part of the brain which controls involuntary actions.
• Reflex action : A natural reaction performed automatically, without thinking
• Iris : Coloured part of eye.

• Pupil : Opening from where light enters the eye.

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Active Science-5