Cellular Respiration

Glucose

A simple sugar that is an important source of energy.

Glucose and oxygen

reactants of cellular respiration

Glycolysis

first step in releasing the energy of glucose, in which a molecule of glucose is broken into two molecules of pyruvate + 2 ATP (does not use oxygen)

Krebs cycle

second stage of cellular respiration, in which pyruvate is broken down into carbon dioxide in a series of hydrogen-extracting reactions; takes place in the mitochondria

Electron transport chain

The third stage of cellular respiration hydrogens that were harvested during the Krebs/Citric acid cycle are moved through proteins creating the energy used to convert ADP into ATP.

ATP (adenosine triphosphate)

The main energy source that cells use for most of their work

Cellular respiration

The process that releases energy by breaking down glucose and other food molecules in the presence of oxygen forming ATP

Breathing out

Removes the Carbon Dioxide produced through cellular respiration

Cellular respiration equation

C6H12O6 + 6O2 + ADP + P---> 6CO2 + 6H2O + ATP

Carbon dioxide and water

products of cellular respiration

Mitochondria

site of aerobic cellular respiration

Aerobic

requires oxygen

Anaerobic

Process that does not require oxygen

Fermentation

A process that makes a limited amount of ATP from glucose without oxygen.

alcohol fermentation

The conversion of pyruvate to carbon dioxide and ethyl alcohol by yeast cells

lactic acid fermentation

The conversion of pyruvate to lactate with no release of carbon dioxide by muscle cells.

why oxygen is needed in aerobic respiration

accepts electrons to form water to keep the electron transport system going.