Glycolysis

• The overall purpose of respiration is to produce ATP.
• Glycolysis happens in the cytoplasm and does not require any energy or oxygen.
• The first step in glycolysis is the phosphorylation of glucose, which uses two ATP molecules to add two phosphate groups onto glucose, making it glucose phosphate.
• Glucose phosphate is a high-energy molecule that splits into two molecules of triose phosphate.
• Triose phosphate is then oxidized to create pyruvate, resulting in a net gain of ATP.
• The oxidization of triose phosphate into pyruvate releases two molecules of ATP, resulting in a net gain of four ATP from glycolysis.