The nervous system
- Created by: ellieborg14
- Created on: 02-06-15 17:32
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- The nervous system
- It allows humans to react to their surroundings and coordinates behaviour.
- The nervous system responds by; skin,tongue, nose ,eyes and ears.
- Receptors are cells that can detect stimuli (changes in the enivironment)
- receptors are often located in the sense organs
- When a receptor is stimulated it sends signals along the nerve cells (neurons) to the brain. The brain then coordinates the response.
- The central nervous system consists of the brain and the spinal cord.
- Neurons are nerve cells that carry information as tiny electrical signals
- Sensory neurons
- Carry signals from the receptor to the spinal cord and brain.
- Motor neurons
- Carry signals from the CNS to the effector
- Relay neurons
- Carry signals from one part of the CNS to another.
- Sensory neurons
- A synapse is the tiny gap when two neurons meet. Signals cross the gap using chemicals called neurone transmitters.
- Reflex actions
- These are very quick responses that do not involve the brain.
- STIMULAS
- RECEPTOR
- SENSORY NEURON
- RELAY NEURON
- MOTOR NEURON
- EFFECTOR
- MOTOR NEURON
- RELAY NEURON
- SENSORY NEURON
- RECEPTOR
- An effector is any part of the body that produces the response.
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