1. Nucleus:
* Function: Houses the cell's genetic material (DNA) and controls cellular activities. It also directs protein synthesis.
2. Ribosomes:
* Function: Sites of protein synthesis. They can be found free-floating in the cytoplasm or attached to the endoplasmic reticulum.
3. Endoplasmic Reticulum (ER):
* Rough ER: Studded with ribosomes. Involved in protein synthesis, folding, and modification.
* Smooth ER: Lacks ribosomes. Involved in lipid and steroid synthesis, detoxification, and calcium storage.
4. Golgi Apparatus:
* Function: Modifies, sorts, and packages proteins and lipids from the ER for secretion or delivery to other organelles.
5. Mitochondria:
* Function: Powerhouses of the cell; they are responsible for cellular respiration, which produces ATP (adenosine triphosphate), the cell's energy currency.
6. Lysosomes:
* Function: Contain digestive enzymes that break down waste materials, cellular debris, and engulfed pathogens.
7. Peroxisomes:
* Function: Small, membrane-bound organelles involved in various metabolic reactions, including detoxification and breakdown of fatty acids.
8. Cytoskeleton:
* Function: A network of protein filaments that provides structural support, helps with cell movement, and facilitates transport within the cell.
9. Centrioles:
* Function: Found in pairs, these organelles play a role in cell division (mitosis and meiosis) by helping to organize microtubules.
10. Plasma Membrane:
* Function: The outer boundary of the cell that regulates what enters and exits the cell, maintaining the cell's internal environment.
11. Cytoplasm:
* Function: The gel-like substance that fills the cell and surrounds the organelles. It provides a medium for cellular reactions and movement.
12. Vesicles:
* Function: Small, membrane-bound sacs that transport substances within the cell.
Note: Some animal cells have specialized structures not included in this list, depending on their function. For example, muscle cells have sarcomeres for contraction.
