Senses and the Brain
- Biology
- Ages 8–11 · Grades 3–5
What you’ll find out
- Receptors in sense organs detect light, sound, touch, heat and more.
- Nerves carry signals to the brain, which interprets them and signals muscles to respond.
- Animals use senses such as echolocation and heat-sensing to survive.
No sign-up and no real names. In the lesson you check your understanding as you read, and practise until it sticks.
Messages to the brain
Your senses are always collecting information about the world. Your eyes detect light, your ears detect sound, your nose and tongue detect smells and tastes, and your skin detects touch, heat and pain. Each sense organ sends messages along nerves, which work like tiny wires, to your brain. The brain works out what the messages mean and decides how the body should respond, all within a fraction of a second.
Animals sense and respond
Animals also use senses and brains to survive, and some have senses that people lack. A bat hunting at night makes high squeaks and listens for the echoes that bounce back, which tell it exactly where a moth is flying. A cat’s whiskers feel tiny movements of air, helping it move in the dark. Some snakes can even sense the body heat of a nearby mouse. The brain turns these messages into action.
Curriculum links: NGSS 4-LS1-2 · Cambridge Primary Stages 4–6: Biology · NCERT Environmental Studies, Classes 3–5