Reflex actions (AQA GCSE Biology Combined Science): Flashcards
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Reflex actions
Reflex actions
Automatic responses without conscious thought
Three key characteristics of reflex actions
Three key characteristics of reflex actions
Automatic, rapid, innate
Reflex arc pathway (in order)
Reflex arc pathway (in order)
Stimulus→Receptor→Sensory neurone→Relay neurone→Motor neurone→Effector→Response
What reflex arcs bypass
What reflex arcs bypass
The conscious brain
Synapse
Synapse
Tiny gap between two neurones
Neurotransmitters
Neurotransmitters
Chemicals that pass messages across synapses
Direction of synaptic transmission
Direction of synaptic transmission
One direction only
Sensory neurone function
Sensory neurone function
Carries message to CNS
Motor neurone function
Motor neurone function
Carries message from CNS to muscles/glands
Effector
Effector
Muscle or gland that creates the response