simple reflexes Flashcards
name three neurones involved in simple reflex arc
sensory
relay
motor
role of the receptor
detects stimulus (a change in the environment)
role of sensory neurone
carries impulses from receptor to the relay neurone
where is the relay neurone
in the CNS
role of relay neurone
carries impulse directly from sensory neurone to motor neurone
role of the motor neurone
carries impulse from relay neurone to effector
effector role
carried out a response
why are reflex arcs fast?
do not involve conscious part of the brain bc impulse is carried directly from the sensory neurone to motor neurone via a relay neurone
impulses are fast alone neurones
why are reflex arcs localised?
NT are secreted directly onto target cells
particular stimulus always produces the same response
why are reflex arc short lived/don’t last long?
re uptake of neurotransmitter is rapid
how to the beneficial features of reflex arc help aid survival?
help protect body from tissue damage
pressure balance
escape from predators
