Labeled diagram of an animal cell showing key organelles and structures.

The image provided is a diagram of an animal cell, and the task is to label the various parts of the cell using the terms provided in the legend. Below is the solution with explanations for each part:

Legend Terms:

- lysosome
- rough ER (Endoplasmic Reticulum)
- ribosomes
- centrioles
- nucleolus
- cytoplasm
- mitochondrion
- smooth ER (Endoplasmic Reticulum)
- cell membrane
- Golgi Body
- nucleus
- vacuole

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Solution:

1. Top Left:
- Label: Cell Membrane
- Explanation: The outer boundary of the cell that regulates the movement of substances in and out of the cell.

2. Second from Top Left:
- Label: Rough ER (Rough Endoplasmic Reticulum)
- Explanation: A network of membranous tubules and sacs studded with ribosomes, involved in protein synthesis and transport.

3. Third from Top Left:
- Label: Ribosomes
- Explanation: Small structures where proteins are synthesized. They can be free-floating or attached to the rough ER.

4. Fourth from Top Left:
- Label: Lysosome
- Explanation: Organelles containing digestive enzymes that break down waste materials and cellular debris.

5. Fifth from Top Left:
- Label: Smooth ER (Smooth Endoplasmic Reticulum)
- Explanation: A network of membranous tubules and sacs without ribosomes, involved in lipid synthesis, detoxification, and calcium storage.

6. Bottom Left:
- Label: Mitochondrion
- Explanation: The powerhouse of the cell, responsible for producing energy (ATP) through cellular respiration.

7. Center Bottom:
- Label: Vacuole
- Explanation: A large, membrane-bound sac used for storage of nutrients, waste products, and other substances.

8. Center Right:
- Label: Golgi Body (Golgi Apparatus)
- Explanation: Modifies, sorts, and packages proteins and lipids for secretion or use within the cell.

9. Second from Top Right:
- Label: Centrioles
- Explanation: Paired cylindrical structures involved in organizing microtubules during cell division.

10. Top Right:
- Label: Nucleus
- Explanation: The control center of the cell, containing the genetic material (DNA).

11. Second from Bottom Right:
- Label: Nucleolus
- Explanation: A dense region within the nucleus where ribosomal RNA is synthesized and ribosomal subunits are assembled.

12. Bottom Right:
- Label: Cytoplasm
- Explanation: The gel-like substance inside the cell membrane where all organelles are suspended.

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Final Labeled Diagram:

1. Cell Membrane
2. Rough ER
3. Ribosomes
4. Lysosome
5. Smooth ER
6. Mitochondrion
7. Vacuole
8. Golgi Body
9. Centrioles
10. Nucleus
11. Nucleolus
12. Cytoplasm

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Final Answer:

\boxed{
\text{1. Cell Membrane, 2. Rough ER, 3. Ribosomes, 4. Lysosome, 5. Smooth ER, 6. Mitochondrion, 7. Vacuole, 8. Golgi Body, 9. Centrioles, 10. Nucleus, 11. Nucleolus, 12. Cytoplasm}
}