Responding to change Flashcards
Stimulus
A change that triggers a receptor in the body.
Response
The change/action that occurs as a result of the stimulus.
Motor neurone
Carry impulse from co-ordinator (CNS) to the area of the body that needs response.
Receptor
Is a cell that detects the stimulus and creates an impulse in the sensory neurone.
Effector
Accepts the impulse from the motor neurone and causes a response. It is usually muscle or gland.
Sensory neurone
Carries the impulse from the receptor to the CNS to tell it about what is happening.
Co-ordinator (Central Nervous System)
Is the brain and spinal cord. Receives info about the stimulus from the sensory neurone and transmits the impulse down the motor neurone so that the correct response occurs.
Order of respond
- Stimulus
- Receptor
- Sensory neurone
- CNS(brain+spinal chord)- Relay neurone(only spinal)
- Motor neurone
- Effector
- Response
Reflex
Reaction that happens automatically that you do not need to think about. The nerve impulse will go to spinal chord and directly to the motor neurone.
Examples of reflex
- touching a hot pan-automatic muscle contraction
- bright light-pupils constrict and eyelid close
Nerve impulses are…
electrical. They pass along neurones which act as a conductor.
Synapse
Where two neurons meet there is a small gap that cannot conduct.
Neurotransmitter
The synapse releases a chemical neurotransmitter, to pass on the nerve impulse and trigger the next neurone.
Nervous system
Enables humans to react to their surroundings and to coordinate their behaviour.
The brain…
coordinates the response.
