Reflex Arc

How is a reflex arc different than other voluntary movements?

• A reflex arc takes the same path as a voluntary action

• A reflex a travels from a sensory neuron to the spinal cord then to a motor neuron, skipping the brain

• A reflex arc takes longer than a voluntary action

• There is no difference between a reflex arc and a voluntary action

In the Patellar reflex arc (knee jerk), the leg muscle is the

• stimulus

• effector

• response

• sensory neuron

Tags

NGSS.MS-LS1-3

Select the correct answer.

A bright light causes your iris to contract the pupil, reducing the amount of light let in.

• the light is the stimulus, the cataract is the effector

• the light is the stimulus, the iris is the effector

• the pupil is the stimulus, the iris is the effector

• the retina is the stimulus, the lens is the effector

Information reaches an effector to evoke a response.

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Receptor indicates a stimulus.

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Information travels along the afferent/sensory pathway to the integration center.

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Tags

NGSS.MS-LS1-3

Association neurons link afferent and efferent pathways.

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Information travels back via the efferent/motor pathway.

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Name an effector in this diagram.

• A

• B

• D

• E

• F

In a reflex arc, the sensory neuron leads to the ___________ and the motor neuron leads to the __________

• Spinal cord, CNS

• CNS, muscle

• Spinal cord, muscle

• Muscle, CNS