CELLULAR RESPIRATION NOTESThere is energy stored in the _________________ between atoms.

This energy is called ____________________________.

___________________________________ is the process that releases energy from food (glucose). When you need energy, your body must break down molecules like glucose to use chemical energy!

Cellular respiration in symbols:

Cellular respiration in words:

The organelle where cellular respiration occurs is the ___________________________.

The Three Stages of Cellular Respiration:

1. Glycolysis occurs in the _____________________ .

- In this stage, _____________________, which has six carbon atoms, is broken in

half to from two molecules of ___________________, which each have three

carbons.

- Breaking the chemical bonds in glucose releases _____________________, which

is used to make two molecules of _______________________.

- In this step, ___________________________ are also removed from glucose and

held by ______________________________________.

2. The Krebs Cycle occurs when pyruvate moves into the matrix of the __________________________.

- In this stage, pyruvate is broken into ___________________, which is exhaled.

- As the bonds in pyruvate are broken, energy is released and used to build two molecules of

________________.

- ____________________ are also removed from pyruvate and held by electron carriers.

3. The Electron Transport Chain (ETC) is the last stage of

cellular respiration. It occurs in the ______________

membrane of the mitochondria.

- Electrons that were being held by ______________

_______________ are given to proteins in the inner

membrane. __________________ from these electrons is

used to pump _________________ out of the matrix. The

protons then flow through a channel back into the

____________________. This releases energy, which is

used to build ____________________________.

- Once used, the electrons are attached to

__________________ and ___________________ atoms

to make _____________________. If oxygen is not

present, ______________________ and

____________________ will NOT occur.