Comp 2. Lecture 1 of-audio

Key learning outcomes for Compendium Two focus on:
- Understanding the structure and function of cells and organelles.
- Exploring cell metabolism, communication, reproduction, and genetic information.

Cell Structure
- Composed of a plasma membrane.
- Internally contains cytoplasm with organelles and a nucleus (control center).
Types of Cell Visualization:
- Schematic diagrams (idealized representation).
- Fluorescent confocal microscopy (false colored images).
- Scanning electron microscopy (surface detail view).
- Transmission electron microscopy (high resolution, internal detail viewing).

Cells must conduct:
- Metabolism: Biological chemical processes using nutrients like oxygen and glucose to produce energy and waste.
- Molecule Synthesis: Production of vital molecules, including proteins, RNA, ATP, and receptors.
- Communication: Sending and receiving signals (chemical/electrical) with other cells.
- Cell Division: Cells can reproduce through processes of mitosis and meiosis, passing genetic information through DNA.

Cells contain various organelles that determine their functionality:
- Different organelles are present depending on the specific function of the cell.

Acts as the security gate, enclosing cellular contents and regulating entry/exit of materials.
Important for intercellular communication and establishing resting membrane potential (electrochemical charge difference).
Structure:
- Composed of a phospholipid bilayer, cholesterol, proteins, and carbohydrates (glycocalyx component).
- Described as a "fluid mosaic model," indicating the dynamic nature of membrane components.

Cytoplasm and Cytosol:
- Cytoplasm: Yellow area containing organelles and the cytosol (the liquid matrix).
- Cytosol: A viscous solution of water, ions, and proteins.
- Contains cytoplasmic inclusions (e.g., melanin for pigment, glycogen for energy).
Cytoskeleton:
- Structural framework composed of microtubules, microfilaments, and intermediate filaments, supporting shape and movement of the cell.

Control center of the cell, containing DNA with genetic information critical for cell function and reproduction.
Components:
- Nuclear envelope (porous), nucleoplasm, and a prominent nucleolus (ribosome production).
- DNA exists as chromatin (uncoiled) in interphase and as chromosomes (coiled) during division.

Types:
- Rough ER: Studded with ribosomes; processes and modifies proteins.
- Smooth ER: Lacks ribosomes; synthesizes lipids and detoxifies.

Functions as the packaging and distribution center of the cell; modifies proteins and lipids produced by the ER.
Sorts and sends these materials to their target destinations within or outside of the cell.

Act as the cell's demolition crew, containing enzymes that digest waste products.
Fuse with vesicles to break down unwanted cellular contents.

Known as the powerhouses of the cell; sites for ATP (energy currency) synthesis.
Feature two membranes; have their own DNA and ribosomes, allowing them to reproduce independently.

Centrioles are barrel-shaped structures important for cell division, forming the centrosome.
Assist in organizing mitotic spindles during cell division.

Cilia: Short hair-like projections involved in moving substances across cell surfaces (e.g., in respiratory tract and fallopian tubes).
Flagella: Longer, whip-like structures primarily found on sperm cells for movement.

Review activity suggested: match organelles to their functions to reinforce learning.
Next lecture will build on this foundational knowledge.