What is the kreb cycle?

Question: What is the kreb cycle?
- Keywords:
  energy,
  kreb,
  life
Asked by Zealousy to Rob, Josh, Chris on 22 Jun 2015.
- Josh Meyers answered on 22 Jun 2015:
  
  The krebs cycle (also known as the citric acid cycle) is a biological pathway that creates chemical energy (ATP) within the mitochondria of all anaerobically respiring cells.
  
  It involves many proteins and other small molecules and is relatively complicated. Citric acid provides a proton gradient which powers a key protein called ATP synthase. This is an amazing molecular machine, it uses the concentration difference across a membrane to turn a motor. This kinetic energy is used to make ATP from ADP and inorganic phosphate.
  
  Check out this video:

Question: What is the kreb cycle?