🔋 Part 2: Mitochondria – The Powerhouse of the Cell

🔹 What is a Mitochondrion?

• Mitochondria (singular: mitochondrion) are rod-shaped organelles.
• They are called “powerhouses of the cell” because they generate energy in the form of ATP.

📘 Real-life example:
They are like the power station in a city, supplying electricity (ATP) to homes (cells).

🧱 Structure of Mitochondria

• Double Membrane:
  • Outer membrane: Smooth, acts like a sieve (filters large molecules).
  • Inner membrane: Folded into cristae to increase surface area.

🧠 Mnemonic: “MOI” – Mitochondria: Outer + Inner membrane
Helps to remember it has two membranes.

🧬 Inside the Mitochondria

1. Cristae:
   • Folds of inner membrane.
   • Increase surface area for reactions (like rolling clothes to fit more in a bag).
2. Matrix:
   • Inner fluid that contains enzymes for Krebs cycle (part of respiration).
3. ATP Synthase (F-1 particles):
   • Enzyme on cristae.
   • Helps produce ATP (energy molecule).
4. Electron Transport Chain:
   • Chain of molecules in inner membrane.
   • Transfers electrons to make energy.

🧬 Mitochondria’s Special Features

• Have their own circular DNA (like bacteria).
• Have their own ribosomes (70S).
• Can reproduce themselves without help from the nucleus.

🎓 Why this is important?
This suggests that mitochondria might have been independent bacteria once (endosymbiosis theory).