
IB Biology: C3.1-Pain Reflex Arcs
Flashcard
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Biology
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9th - 12th Grade
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Practice Problem
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Hard
Herbert Asiedu-Mante
FREE Resource
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8 questions
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1.
FLASHCARD QUESTION
Front
What is a reflex action?
Back
A reflex action is a rapid, automatic or involuntary response to a specific stimulus.
2.
FLASHCARD QUESTION
Front
What is a reflex arc?
Back
A reflex arc is the path (including participating cells) along which impulses travel in a reflex action.
3.
FLASHCARD QUESTION
Front
What is the purpose of reflex actions?
Back
Reflex actions provide a means of automatically and rapidly integrating and coordinating stimuli with the responses of effectors aimed at protecting the body from harm.
4.
FLASHCARD QUESTION
Front
What is an example of an involuntary response involving skeletal muscles?
Back
A reflex arc is an example of involuntary responses with skeletal muscles as the effector.
5.
FLASHCARD QUESTION
Front
What happens when a finger touches a sharp pin?
Back
Receptors initiate afferent action potentials that travel through the hand to the spinal cord through one of the spinal nerves.
6.
FLASHCARD QUESTION
Front
What occurs when the afferent neuron enters the spinal cord?
Back
The afferent neuron synapses with an interneuron in the grey matter.
7.
FLASHCARD QUESTION
Front
What is the role of the interneuron or relay neuron in a reflex arc?
Back
The interneuron or relay neuron synapses with a motor neuron in the grey matter.
8.
FLASHCARD QUESTION
Front
What happens after the motor neuron receives action potentials?
Back
The action potentials passed to the motor neuron go directly to the arm muscles (effector), stimulating them to contract and pull the finger away from the sharp pin.
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