Cellular Respiration

During photosynthesis the Sun’s energy is captured & stored in the form of carbohydrates & other organic molecules

What happens to this stored energy? Most of the stored energy will be used for

the life processes of the autotroph Some will be reserved & available to

heterotrophs, who in turn, use it for their own life processes

All cells break down complex organic compounds into simpler molecules

Cells use some of the energy released to produce ATP from ADP & phosphate

Respiration All cells break down complex organic

compounds into simpler molecules Breaking down releases energy stored in

the molecular bonds of the organic compounds

Some of the energy released to produce ATP from ADP & phosphate

Organic Compounds

No Oxygen

Fermentation(anaerobic)

Oxygen

Aerobic Respiration

ATP

ATPGlycolysis

Glycolysis 1st phase of cellular respiration Produces ATP & other products Little ATP formed Other products will follow one of two

additional pathways Which path followed depends on the

presence or lack of O2

Glycolyisis – a biochemical pathway 6 carbon chain molecule broken & 2 STP

molecules, through a series of steps, into 2 – 3 carbon molecules (pyruvic acid molecules) AND 4 molecules of ATP

2 ATP used & 4 made ! Happens in the cytosol

What happens to the Pyruvic Acid? Depends on whether or not oxygen is

present

Where does respiration happen? In the cytosol if no oxygen is present

Where does respiration happen? In the mitochondria if oxygen is present

The Outer Membrane

The outer membrane contains many complexes of integral membrane proteins that form channels through which a variety of molecules and ions move in and out of the mitochondrion.

The Inner Membrane Forms the inner folds of the cristae

Cristae Cristae are the finger-like projections of

the inner mitochondrial membrane and they increase the surface area for the electron tranport carriers and ATP synthase which are located in the membrane.

The Matrix

The matrix contains a complex mixture of soluble enzymes that catalyze the respiration of pyruvic acid and other small organic molecules.