Responding to Change
- Created by: Annie
- Created on: 14-01-13 17:32
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- Responding to Change
- Nervous System
- Enables you to react to surroundings and co-ordinate your behaviour
- Impulses
- Electrical signals which travel very quickly around your body- they enable you to react very quickly
- Stimuli
- A change in your own natural environment
- Receptors
- Pick up stimuli
- Sense Organs
- (most like animal cells) usually found in large clusters which form organs such as eyes and skin, ears, tongue
- Neurons
- Once, Sensory receptor detects a stimulus, it sends information (sent as electrical impulse) down special cells called neurons. Which can be found in large bundles. They are called nerves.
- CNS
- The impulse travels along until it reaches CNS. Brain, Spinal Chord.
- Sensory Neurons
- Cells which carry impulses from sense organs.
- Motor Neurons
- The brain gets huge amounts of info from all sensory receptors. It co-ordinates all the information and sends impulses along cells. they carry info from CNS to the rest of your body.
- Effector Organs
- A MUSCLE OR GLAND. They respond to impulses by contracting.
- Secreting
- Muscles respond by releasing chemicals
- Nervous System
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