Here's a breakdown:
* Organic molecules: These are molecules like glucose (sugar) that contain chemical bonds storing energy.
* ATP (adenosine triphosphate): This is the primary energy currency of cells. It stores energy in its phosphate bonds.
* Cellular Respiration: This is a series of metabolic reactions that break down organic molecules, releasing the energy stored in their bonds and using it to produce ATP.
Cellular respiration can be divided into four main stages:
1. Glycolysis: Glucose is broken down into pyruvate, producing a small amount of ATP.
2. The Krebs Cycle (Citric Acid Cycle): Pyruvate is further broken down, generating more energy carriers like NADH and FADH2.
3. Electron Transport Chain: Electrons from NADH and FADH2 are passed along a series of protein complexes, releasing energy that is used to pump protons across a membrane.
4. Oxidative Phosphorylation: The flow of protons back across the membrane drives the production of ATP, generating the majority of ATP from cellular respiration.
So, in essence, cellular respiration takes the energy stored in organic molecules and converts it into a usable form for the cell, ATP.
