Eukaryotic Organelles Animal Cells

Organelles are specialized structures within a cell that perform distinct functions.

Nucleus: Contains DNA and controls cell activities.
Smooth Endoplasmic Reticulum (SER): Synthesizes lipids, oils, phospholipids, and steroids; stores calcium ions.
Rough Endoplasmic Reticulum (RER): Studded with ribosomes, where protein synthesis occurs.
Mitochondrion: Site of cellular respiration; generates ATP from food.
Lysosome: Contains digestive enzymes for breaking down waste materials.
Golgi Complex: Modifies, sorts, and packages proteins from the RER.
Plasma Membrane: Surrounds the cell; semi-permeable structure that regulates transport in and out of the cell.
Microtubules and Microfilaments: Components of the cytoskeleton, aiding in structure and transport within the cell.
Cytoskeleton: Provides internal organization and shape to the cell.

Chapter 4 Key Concepts:
- Nucleus and Ribosomes
- Endomembrane System
- Energy-Converting Organelles
- Cytoskeleton and Cell Surfaces

Uses visible light and glass lenses; magnification up to 1000x.
Can observe both living and nonliving specimens; staining may be required for visibility.

Utilizes a beam of electrons to achieve high magnifications (up to 1,000,000x).
Two types:
- Scanning Electron Microscope (SEM): Studies cell surfaces.
- Transmission Electron Microscope (TEM): Examines internal structures.

Cells must be of sufficient size to hold essential organelles (DNA, proteins, etc.) while maintaining a favorable surface area-to-volume ratio for efficient exchange with the environment.

Contain membrane-bound organelles, facilitating multicellular life forms.
Key features include:
- Nucleus
- Mitochondria
- Golgi apparatus
- Endoplasmic reticulum (Rough and Smooth)

Make Energy (ATP): Required for cellular activities; waste management necessary.
Make Proteins: Essential for various cellular functions.
Make More Cells: For growth and repair of damaged cells.

Functions: Storage of DNA, directing protein synthesis.
Components:
- Nucleolus: Site for rRNA synthesis.
- Nuclear Membrane: Bilayer that regulates material exchange.
- Nuclear Pores: Protein networks for transport across the nuclear membrane.

Pathway for synthesis, storage, and transport of macromolecules.
Components: Endoplasmic Reticulum, Golgi Bodies, Vesicles.
- Rough ER: Protein synthesis.
- Smooth ER: Synthesis of lipids and detoxification.

Function: Sites of protein synthesis; can exist freely in cytoplasm or attached to the ER.
Composed of a large and small subunit.

Functions: Modification and packaging of molecules from the ER into vesicles for transport and secretion.
Structure consists of flattened sacs known as cisternae.

Function: Digestion of macromolecules and waste; can eliminate non-functioning cells.
Contains about 40 different digestive enzymes; synthesized in RER and packaged in the Golgi complex.

Function: Breakdown fatty acids and detoxify harmful substances; convert hydrogen peroxide into water and oxygen.

Function: Protects the cell; allows selective transport of materials; crucial for cell communication.
Structure: Composed of a phospholipid bilayer with embedded proteins.

Function: Site of cellular respiration, converting food into ATP.
Structure: Double membrane with inner membrane folded into cristae to increase surface area for energy production.

Provides structural support and facilitates movement of organelles within the cell.
Composed of:
- Microtubules
- Microfilaments