Cell resp

Today’s Objective:

Given information and/or diagrams on cellular respiration, write and/or identify the cellular respiration equation, raw materials, products, and sites.

Muhammad Asif Pu Pakistan

Cellular RespirationPresented by: Muhammad Asif

Energy for life’s activities


Overview of Cellular Respiration

The life processes of all organisms require energy.

The potential energy held in the bonds of food molecules CANNOT be used directly by the cell.

Energy from food must be converted to the ONLY energy source that cells can use ATP!


Cellular Respiration

Respiration is the process by which the energy in the bonds of nutrients are used to synthesize ATP.

Respiration occurs continuously in all cells of all organisms.


Anaerobic Respiration

Also called fermentation No oxygen is present 1 Glucose only partially broken down to

form waste products and 2 ATP


Anaerobic Pathways

Glucose 2 lactic acid + 2 ATP– Happens in muscle cells when they run out

of oxygen– Happens in bacteria that make yogurt,

cheese, dill pickles

Glucose 2 ethanol + 2 CO2 + 2 ATP

– Happens in some bacteria– Happens in YEAST


Aerobic Respiration

Has to have oxygen VERY EFFICIENT Most organisms on earth are aerobic 1 glucose completely broken down to

carbon dioxide and water. C6H12O6 + 6 O2 6 CO2 + 6 H2O + E


Aerobic Pathway

Takes place mostly in mitochondria 3 primary steps:

– Glycolysis in cytoplasm: produces pyruvate and 2 net ATP (anaerobic)

– Kreb’s cycle in matrix of mitochondria: converts pyruvate to Acetyl-CoA (aerobic)

– Electron transport chain on membrane of mitochondria: moves electrons to produce 34 ATP (aerobic)


Comparing Aerobic & Anaerobic Cellular Respiration Pathways

Aerobic (needs oxygen)

Anaerobic

(no oxygen)

Occurs in: Most organisms

Mostly yeast and bacteria

1 glucose makes:

6 CO2 + 6 H2O Ethanol + CO2 or lactic acid

Net ATP production:

36 2


Adaptations for Respiration

Bacteria, protists & fungi– Respiratory gases are exchanged by

diffusion Plants

– Respiratory gases are exchanged through leaves, stems, and roots

– Moves in and out of cells by diffusion but leaves and stems also have openings to the environment (stomata and lenticels)


Adaptations for Respiration in Animals Techniques vary:

– Simple diffusion across cell membranes – Diffusion across moist skin into a

circulatory system– Openings to the environment that can be

flapped open and closed with a circulatory system to transport gases

– Specialized respiratory structures (e.g. lungs) to speed exchange of respiratory gases


Education

Cell resp