Animal Responses (OCR A-Level Biology A): Flashcards
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Definition of reflex action
Definition of reflex action
Automatic, involuntary response to specific stimulus
3 characteristics of reflex actions
3 characteristics of reflex actions
Involuntary, rapid, protective
5 stages of reflex arc
5 stages of reflex arc
Stimulus→Receptor→Coordinator→Effector→Response
Response characteristic in reflex arc
Response characteristic in reflex arc
Always identical for a given stimulus
Knee-jerk reflex coordinator
Knee-jerk reflex coordinator
Spinal cord
Unique feature of knee-jerk reflex
Unique feature of knee-jerk reflex
No relay neurone; only one synapse
Why reflexes are rapid
Why reflexes are rapid
Minimal synapses = fewer delays in signal transmission
Blinking reflex coordinator
Blinking reflex coordinator
Medulla oblongata (in brain)
Blinking reflex effector muscles
Blinking reflex effector muscles
Superior levator palpebrae & orbicularis oculi
Knee-jerk reflex stimulus
Knee-jerk reflex stimulus
Stretching of quadriceps muscle