[Respiration Notes]

Aerobic Respiration

Aerobic means respiration in the presence O2

In the presence of O2, glucose is completely broken down, yielding 36 net ATP for use by the cell.

The 3 Main Steps of Aerobic Respiration:

1) Glycolysis- Makes 2 net ATP

2) Krebs Cycle- 2 ATP

3) Electron Transport- 32 ATP

After glycolysis occurs, pyruvates enter the mitochondria and diffuse to the matrix.

At the matrix, the Krebs Cycle occurs. Here, the remaining hydrogen atoms and their energy rich electrons are removed.

In one turn of the Krebs Cycle, 2 ATP, 1 FADH2, and 3 NADH are made.

In one turn of the Krebs Cycle, 2 CO2 are released.

The 2 ATP are available for use by the cell.

The FADH2 and 3 NADH proceed to the Cristae where they provide energy for Electron Transport (also known as oxidative phosphorylation).

The energy provided by all the NADH and FADH2 is used

a. to pump H ions into the outer compartment.

b. this creates a charge imbalance across the cristae (high potential energy).

c. as H ions diffuse back to the matrix, they pass through a protein channel with an enzyme, ATP synthase, which takes the energy released by the H ions and uses it to create ATP (from ADP + P).

d. Oxygen bonds with 2 hydrogen ions (removing them so aerobic respiration can continue) to form water.

[More Info on the Krebs Cycle] [More Info on Electron Transport/ Oxidative Phosphorylation]