Solved NERVOUS SYSTEM WORKSHEET 1. The diagram below is of a ... - Free Printable

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1. Labeling the Diagram of a Neuron

We are given a diagram of a neuron and asked to label the following parts:

- Axon
- Myelin sheath
- Cell body
- Dendrites
- Axon terminals

Looking at the diagram:

- 1 is the cell body – it contains the nucleus and is the central part of the neuron.
- 2 is the axon terminals – these are the ends of the axon that release neurotransmitters.
- 3 is the dendrites – these are the branching structures that receive signals from other neurons.
- 4 is the axon – the long fiber that carries nerve impulses away from the cell body.
- 5 is the myelin sheath – the fatty layer that wraps around the axon to speed up signal transmission.

So, labeling the diagram:

- 1 → Cell body
- 2 → Axon terminals
- 3 → Dendrites
- 4 → Axon
- 5 → Myelin sheath

✔ Diagram labels:
- 1: Cell body
- 2: Axon terminals
- 3: Dendrites
- 4: Axon
- 5: Myelin sheath

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2. Matching Terms with Descriptions

Now let’s match each description (1–12) with the correct term from the list:

#### List of Terms:
A. Synapse
B. Axon
C. Myelin sheath
D. Nerve impulse
E. Sense receptor
F. Response
G. Reflex
H. Cell body
I. Dendrite
J. Nerve
K. Neurotransmitter
L. Axon terminal

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Now go through each description:

1. The long fiber that carries the nerve impulses.
→ This is the axon
✔ Answer: B. Axon

2. A bundle of axons.
→ A group of axons together is called a nerve
✔ Answer: J. Nerve

3. The connection between adjacent neurons.
→ This is the synapse
✔ Answer: A. Synapse

4. The chemical secreted into the gap between neurons at a synapse.
→ This is the neurotransmitter
✔ Answer: K. Neurotransmitter

5. A rapid automatic response to a stimulus.
→ This is a reflex
✔ Answer: G. Reflex

6. The covering of fatty material that speeds up the passage of nerve impulses.
→ This is the myelin sheath
✔ Answer: C. Myelin sheath

7. The structure at the end of an axon that produces neurotransmitters to transmit the nerve impulse across the synapse.
→ This is the axon terminal
✔ Answer: L. Axon terminal

8. The high-speed signals that pass along the axons of nerve cells.
→ These are nerve impulses
✔ Answer: D. Nerve impulse

9. The branching filaments that conduct nerve impulses towards the cell.
→ These are dendrites
✔ Answer: I. Dendrite

10. The sense organ or cells that receive stimuli from within and outside the body.
→ These are sense receptors
✔ Answer: E. Sense receptor

11. The reaction to a stimulus by a muscle or gland.
→ This is a response
✔ Answer: F. Response

12. The part of the nerve cell containing the nucleus.
→ This is the cell body
✔ Answer: H. Cell body

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✔ Final Answers for Part 2:

| Term | Description |
|------|-------------|
| B. Axon | 1. The long fiber that carries the nerve impulses. |
| J. Nerve | 2. A bundle of axons. |
| A. Synapse | 3. The connection between adjacent neurons. |
| K. Neurotransmitter | 4. The chemical secreted into the gap between neurons at a synapse. |
| G. Reflex | 5. A rapid automatic response to a stimulus. |
| C. Myelin sheath | 6. The covering of fatty material that speeds up the passage of nerve impulses. |
| L. Axon terminal | 7. The structure at the end of an axon that produces neurotransmitters to transmit the nerve impulse across the synapse. |
| D. Nerve impulse | 8. The high-speed signals that pass along the axons of nerve cells. |
| I. Dendrite | 9. The branching filaments that conduct nerve impulses towards the cell. |
| E. Sense receptor | 10. The sense organ or cells that receive stimuli from within and outside the body. |
| F. Response | 11. The reaction to a stimulus by a muscle or gland. |
| H. Cell body | 12. The part of the nerve cell containing the nucleus. |

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📌 Summary

This worksheet tests your understanding of basic neuron anatomy and nervous system terminology. The key concepts include:

- Neuron structure: dendrites (input), cell body (processing), axon (output), myelin sheath (insulation), axon terminals (release).
- Signal transmission: nerve impulse → axon → synapse → neurotransmitter → next neuron.
- Reflex arc: stimulus → sense receptor → sensory neuron → interneuron → motor neuron → response.

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