The Human Nervous System (AQA GCSE Biology): Flashcards
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Reflex arc definition
Reflex arc definition
The pathway taken by nerve impulses in a reflex action
Key characteristics of reflex actions
Key characteristics of reflex actions
Automatic and rapid responses
Purpose of reflex actions
Purpose of reflex actions
Protect the body from harm
First stage of reflex arc
First stage of reflex arc
Stimulus detected by receptors
Second stage of reflex arc
Second stage of reflex arc
Sensory neuron sends impulse to spinal cord
Third stage of reflex arc
Third stage of reflex arc
Impulse passes to relay neuron in spinal cord
Alternative name for relay neuron
Alternative name for relay neuron
Interneuron
Fourth stage of reflex arc
Fourth stage of reflex arc
Relay neuron passes impulse to motor neuron
Fifth stage of reflex arc
Fifth stage of reflex arc
Motor neuron carries impulse to effector
Types of effectors in reflex arc
Types of effectors in reflex arc
Muscle or gland
Why reflex arcs enable quick responses
Why reflex arcs enable quick responses
They don't involve the conscious part of the brain
Examples of reflex actions
Examples of reflex actions
Withdrawing hand from heat, blinking at approaching objects