The image illustrates a
three-neuron reflex arc, which is a fundamental concept in neuroscience. A reflex arc is a neural pathway that controls a reflex action, allowing the body to respond quickly to stimuli without involving higher brain centers. Let's analyze the diagram and match the labels with the corresponding descriptions.
Reflex Arc Components:
1.
Receptor (Sensory Neuron): Detects the stimulus.
2.
Spinal Cord: The central processing unit where the reflex is coordinated.
3.
Relay Neuron (Interneuron): Transmits the signal from the sensory neuron to the motor neuron.
4.
Motor Neuron: Carries the signal from the spinal cord to the effector.
5.
Effector (Muscle or Gland): Produces the response.
Matching the Labels:
#### 1) Receptor (Sensory Neuron)
-
Description: "The receptor cells in our hands touch a sharp pin. The sensory neuron relays this information to our spinal cord."
-
Label: This corresponds to
(1) in the diagram, as it shows the sensory neuron detecting the stimulus (sharp pin).
#### 2) Spinal Cord
-
Description: "The impulse arrives at our PNS – our spinal cord which can respond to the small stimuli."
-
Label: This corresponds to
(2) in the diagram, as it shows the spinal cord where the reflex is processed.
#### 3) Relay Neuron (Interneuron)
-
Description: "The relay neuron passes on the impulse to the appropriate motor neurone."
-
Label: This corresponds to
(3) in the diagram, as it shows the interneuron within the spinal cord connecting the sensory and motor neurons.
#### 4) Motor Neuron
-
Description: "The motor neurone delivers the impulse to a muscle that makes the effector cells move."
-
Label: This corresponds to
(4) in the diagram, as it shows the motor neuron carrying the signal from the spinal cord to the effector.
#### 5) Effector (Muscle)
-
Description: "The impulse is travelling through the body in the motor neurone."
-
Label: This corresponds to
(5) in the diagram, as it shows the muscle (effector) responding to the signal by contracting.
Final Answer:
1.
Receptor (Sensory Neuron) →
(1)
2.
Spinal Cord →
(2)
3.
Relay Neuron (Interneuron) →
(3)
4.
Motor Neuron →
(4)
5.
Effector (Muscle) →
(5)
Thus, the completed labels are:
\[
\boxed{1. \text{Receptor (Sensory Neuron)}, 2. \text{Spinal Cord}, 3. \text{Relay Neuron (Interneuron)}, 4. \text{Motor Neuron}, 5. \text{Effector (Muscle)}}
\]
Parent Tip: Review the logic above to help your child master the concept of reflex arc worksheet.
