Student Worksheet
LSM 9.1-5
The Reflex Arc
Events of a Reflex Arc
Number the following events of the reflex arc in the correct order.
Message causes muscle to contract.
Message reaches interneuron dendrite.
Message splits: one to brain, one to motor neuron dendrite.
Message travels along motor neuron axon.
Message travels along sensory axon.
Message travels along sensory dendrite.
Stimulus causes action potentials in the sensory receptor.
238 Chapter 9 How Nerve Signals Maintain Homeostasis
Copyright © 2003 Nelson
Student Worksheet Solutions
LSM 9.1-6
The Reflex Arc, Solution
to brain
interneuron
motor neuron
spinal cord
sensory neuron
response
muscle fibres
contract
sensory
receptor
stimulus
Events of a Reflex Arc
Number the following events of the reflex arc in the correct order.
Message causes muscle to contract. 7
Message reaches interneuron dendrite. 4
Message splits: one to brain, one to motor neuron dendrite. 5
Message travels along motor neuron axon. 6
Message travels along sensory axon. 2
Message travels along sensory dendrite. 3
Stimulus causes action potentials in the sensory receptor. 1
Copyright © 2003 Nelson
Chapter 9 How Nerve Signals Maintain Homeostasis 239