Reflex Arc (AQA A-Level Biology): Flashcards
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Reflex arc definition
Reflex arc definition
Simplest nervous pathway that produces involuntary response to stimulus
Type of response produced by reflex arc
Type of response produced by reflex arc
Involuntary
Number of neurones in most reflex arcs
Number of neurones in most reflex arcs
Three
Where most reflex arcs occur
Where most reflex arcs occur
Spinal cord
7 stages of reflex arc (in order)
7 stages of reflex arc (in order)
Stimulus→Receptor→Sensory→Intermediate→Motor→Effector→Response
Function of sensory neurone in reflex arc
Function of sensory neurone in reflex arc
Carries nerve impulses from receptor to spinal cord
Function of intermediate neurone
Function of intermediate neurone
Links sensory neurone to motor neurone in spinal cord
Function of motor neurone in reflex arc
Function of motor neurone in reflex arc
Carries impulses from spinal cord to effector muscle
Why reflex arcs are fast
Why reflex arcs are fast
Very few synapses (1-2), no conscious decision-making
When reflexes start working
When reflexes start working
From birth, don't require learning