Nervous System Worksheet featuring a labeled diagram of a neuron, coloring instructions, and a matching activity for different types of neurons and their functions.

Let's go through the Nervous System Worksheet step by step and solve each part with clear explanations.

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1. Labeling the Diagram of a Neuron

Here is the diagram of a neuron (nerve cell). We need to label the following parts:

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

#### Step-by-step identification:

- Dendrites: These are the branched structures extending from the cell body that receive signals from other neurons. They look like tree branches on the left side of the neuron.

- Cell body (soma): The central, round or oval part containing the nucleus. It’s located near the dendrites.

- Axon: The long, slender projection extending from the cell body that transmits electrical impulses away from the cell body. It runs from the cell body to the right end of the diagram.

- Myelin sheath: The segmented, fatty layer surrounding the axon (looks like beads or ovals along the axon). It insulates the axon and speeds up nerve impulse conduction.

- Axon terminals: The small bulb-like endings at the very end of the axon that release neurotransmitters to communicate with other cells (e.g., muscle fibers).

- Muscle fibers: The elongated, striated structures on the far right that the axon terminals connect to. These are the target cells (muscles) that respond to nerve signals.

> ✔ Labels should be placed as follows:
>
> - Dendrites → on the left side (branching structure)
> - Cell body → central round area
> - Axon → long extension from cell body
> - Myelin sheath → oval segments along the axon
> - Axon terminals → ends of axon near muscle fibers
> - Muscle fibers → striped structures on the far right

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2. Coloring the Diagram

Use the color code provided:

| Structure | Color |
|-------------------|-----------|
| Axon | Purple |
| Axon Terminals | Orange |
| Myelin sheath | Yellow |
| Cell body | Blue |
| Dendrites | Green |
| Muscle fibers | Red |

> ✔ Color accordingly:
>
> - Color the dendrites green
> - Color the cell body blue
> - Color the axon purple
> - Color the myelin sheath yellow (the oval segments along the axon)
> - Color the axon terminals orange
> - Color the muscle fibers red

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3. Matching Neuron Types with Functions

We have three types of neurons:

- A. Motor neuron
- B. Sensory neuron
- C. Relay neuron

Now match them to their functions:

#### Function 1:
> "The nerve cell that carries impulses from a sense receptor to the brain or spinal cord."

✔ This describes a Sensory neuron
→ Answer: B. Sensory neuron

> *Explanation:* Sensory neurons detect stimuli (like touch or pain) from the environment and send signals to the central nervous system (brain/spinal cord).

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#### Function 2:
> "The nerve cell that connects sensory and motor neurons"

✔ This describes a Relay neuron
→ Answer: C. Relay neuron

> *Explanation:* Relay neurons (also called interneurons) are found in the central nervous system and process information between sensory and motor neurons.

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#### Function 3:
> "The nerve cell that transmits impulses from the brain or spinal cord to a muscle or gland"

✔ This describes a Motor neuron
→ Answer: A. Motor neuron

> *Explanation:* Motor neurons carry signals from the CNS to effectors (muscles or glands), causing movement or secretion.

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✔ Final Answers for Question 3:

| Kind of neuron | Function |
|----------------|---------|
| B. Sensory neuron | The nerve cell that carries impulses from a sense receptor to the brain or spinal cord. |
| C. Relay neuron | The nerve cell that connects sensory and motor neurons |
| A. Motor neuron | The nerve cell that transmits impulses from the brain or spinal cord to a muscle or gland |

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📌 Summary of Completed Worksheet:

1. Label the diagram using correct anatomical terms.
2. Color according to the key:
- Dendrites → Green
- Cell body → Blue
- Axon → Purple
- Myelin sheath → Yellow
- Axon terminals → Orange
- Muscle fibers → Red
3. Matching:
- Sensory neuron → Carries impulses from receptors to CNS
- Relay neuron → Connects sensory and motor neurons
- Motor neuron → Sends impulses from CNS to muscles/glands

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