14.4 - Reflexes Flashcards
What a reflex arc is The stages of a reflex arc The importance of reflex arcs
What is a reflex arc?
Neural pathway causing involuntary reaction to stimulus
What is a withdrawal reflex?
Reflex action moving away from danger
What are reflex arcs typically composed of?
Three types of neurone
Where are many reflex arcs controlled?
Spinal cord
What are the stages of a reflex arc?
Stimulus
What is the role of the receptor?
Detects stimulus
What is the role of the sensory neurone?
Transmits impulses to relay neurone
What is the role of the relay neurone?
Connects sensory to motor neurones
What is the role of the motor neurone?
Transfers impulses to effector
What is the role of the effector?
Muscle or gland carrying out response
What are the key features of reflex arcs?
Involuntary
Why are reflex arcs important?
Bodily protection and function