Cellular
Respiration
Chapter 4, sections 1 and 4-6
What Is ATP?


Stands for
adenosine
triphosphate
Is the cell’s
energy currency
Clip – 2:26
How Do We Get Energy From ATP?
By breaking
the highenergy
bonds
between the
phosphate
groups
When is ATP Made in the Body?

During a process called cellular
respiration that takes place in both
plants & animals
clip – 1:54
Cellular Respiration

Includes pathways that require
oxygen

So cellular respiration is often referred
to as aerobic respiration

Breakdown of one glucose results
in 36 to 38 ATP molecules

Animation (“The Big Picture”)
What are the Stages of Cellular
Respiration?




Glycolysis
The Krebs Cycle
The Electron Transport Chain
Animation
Where Does Cellular Respiration
Take Place?

It actually takes
place in two
parts of the cell:


Glycolysis
occurs in the
cytoplasm
Krebs Cycle &
ETC occur in the
mitochondria
Glycolysis Summary
•Takes place in the cytoplasm
•Anaerobic (doesn’t use oxygen)
•Requires input of 2 ATP; this is
considered the energy-investment
phase
With Oxygen….Or Without


If oxygen is present, the end product of
glycolysis will go to mitochondrion for the rest
of cellular respiration and produce LOTS of
energy
If oxygen is not present, then the end product
of glycolysis will enter fermentation


Muscle cells enter lactic acid fermentation
Yeast enters ethanol fermentation
With Oxygen – Krebs Cycle & Electron
Transport Chain

Krebs Cycle

CO2 is produced in the Krebs Cycle
2 ATP are also formed in the Krebs Cycle

Animation – go to “Krebs Cycle”


Electron Transport Chain

34 ATP produced in ETC
H2O is electron acceptor (you breathe this
out)

Animation – go to “Electron Transport Chain”

Electron Transport Chain
Review of Cellular Respiration – 6:01