Nervous System Flashcards
Nervous system
Detects and reacts to stimuli
What is the nervous system made up of?
4
Central Nervous System
Sensory neurones
Motor neurones
Effectors
CNS
Connected to body by sensory neurones and motor neurones in mammals
In vertebrates consists of brain and spinal cord only
Sensory neurones
Neurones that carry info as electrical impulses from receptors to CNS
Motor neurones
Neurones that carry impulses from CNS to effectors
Effectors
All muscles and glands which respond to nervous impulses
Receptors
Cells that detect stimuli
Order of CNS
Stimulus—>Receptor—>Sensory neurone—>CNS—>Motor neurone—>Effectors—> Response
Synapses
Connect neurones
=
How is a nerve signal transferred from one neurone to another?
Chemicals diffuse across gap
Chemicals set off a new electrical signal in next neurone
Reflexes
Rapid, automatic responses to a certain stimuli that don’t involve conscious part of brain
Reflex arc
Passage of info in a reflex (from receptor to effector)
Reflex arc pathway
Receptor—>Sensory neurone —> relay neurone —> motor neurone —> effector
Reaction time
Time taken to respond to a stimulus
How to measure reaction time
Ruler drop test
OR
Computer
