B1- The Nervous System Flashcards
What is the main job of the nervous system
React to surroundings and coordinate behaviour
What are the two nervous systems and what do they contain
Central nervous system and the peripheral nervous system. They contain receptors and neurones
What part of the nervous system detects changes in surroundings
Receptors
What are the bodies nerve endings and what do they detect
Light receptors in the eyes
Sounds receptors and balance receptors in the ears
Taste receptors on the tongue
Smell receptors in the nose
Touch,pressure and pain receptors in the skin.
What are neurones
Specially adapted cells that can carry a nerve impulse
What is a nerve impulse
Electrical messages that are carried along the axon
What are the three neurones
Sensory
Relay
Motor
What does the sensory neurone do
Carry nerve impulse from the receptors to your brain
What does the relay neurone do
Make connections been neurones in your brain and spinal cord
What does the motor neurones do
Carry nerve impulses from your brain to your muscles and glands
What are 3 properties of neurones and what are they for
Long shape of I make connections between parts of the body
Insulating sheath to speed up the nerve impulse
Dendrites or branched endings to allow a single neurone to act on many muscle fibres
What is a synapse
A small gap between neurones
How do synapses work
A transmitter substance diffuses the neurone across the synapse and then the transmitte binds with a receptor on the next neurone, causing the electrical impulse to be initiated in to that neurone
What are voluntary actions
Conscious decisions you make in response to a stimulus
What is the main job of the nervous system
React to surroundings and coordinate behaviour
What are the two nervous systems and what do they contain
Central nervous system and the peripheral nervous system. They contain receptors and neurones
What part of the nervous system detects changes in surroundings
Receptors
What are the bodies nerve endings and what do they detect
Light receptors in the eyes
Sounds receptors and balance receptors in the ears
Taste receptors on the tongue
Smell receptors in the nose
Touch,pressure and pain receptors in the skin.
What are neurones
Specially adapted cells that can carry a nerve impulse
What is a nerve impulse
Electrical messages that are carried along the axon
What are the three neurones
Sensory
Relay
Motor
What does the sensory neurone do
Carry nerve impulse from the receptors to your brain
What does the relay neurone do
Make connections been neurones in your brain and spinal cord
What does the motor neurones do
Carry nerve impulses from your brain to your muscles and glands
