Human Cell Structure and Function

📋 Course Outline

1. Human cell organization and protoplasm
2. Nucleus and nucleoli functions
3. Ribosomes and protein translation
4. Endoplasmic reticulum and Golgi processing
5. Lysosomes, peroxisomes, and secretory vesicles
6. Mitochondria and ATP energy production
7. Cytoskeleton and cell membrane transport
8. Endocytosis and intracellular digestion
9. Cell signaling: juxtacrine, paracrine, endocrine

📖 1. Human cell organization and protoplasm

🔑 Key Concepts & Definitions

• Cell membrane : A cell membrane is a selectively permeable boundary that controls what enters and leaves the cell and helps maintain internal conditions.
• Cell membrane proteins : Cell membrane proteins are specialized molecules embedded in the membrane that enable transport, signaling, and cell-to-cell interactions.
• Endoplasmic reticulum : The endoplasmic reticulum is an internal membrane network that supports synthesis and processing of proteins and lipids.
• Golgi apparatus : The Golgi apparatus is a membrane organelle that modifies, sorts, and packages proteins and lipids for their final destinations.
• Mitochondria : Mitochondria are organelles that generate chemical energy by producing ATP through cellular respiration.

📝 Essential Points