do animals breath? how do animals get their energy? cellular respiration
Post on 25-Dec-2015
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Cellular Respiration EquationC6H12O6 + 6O2 6CO2 + 6H2O + cell energy
(ATP)
In words…..Glucose + oxygen carbon dioxide + water +
energy
1. The process called cellular respiration releases the energy in carbohydrates in two steps.
1. Glycolysis2. Krebs Cycle
2. All Cells perform cellular respiration to get energy/ATP
Cells and Energy – Cellular Respiration
Step 1: Glycolysis glyco – sugar lysis – to break down
• Glycolysis occurs in the cell’s cytoplasm.• One glucose molecule breaks into 2 smaller
molecules called pyruvate and also makes 2 ATP molecules
Step 2a: Krebs Cycle (Oxidative Respiration)
• **Only if Oxygen is present• occurs in the mitochondria• The products from Glycolysis go
through aerobic respiration.• In this process pyruvate is
turned into Acetyl CoA to begin the Krebs Cycle
• The Krebs cycle produces 34
ATP molecules!!
Step 2b: Fermentation• Only if oxygen is NOT present.• 2 types of fermentation:– Alcoholic fermentation:
• EX: In yeasts it produces alcohol and carbon dioxide. • It causes bread dough to rise. Another example is grapesalcohol.
– Lactic Acid fermentation• Occurs in muscle cells, • The pyruvic acid accumulates as a result of glycolysis
producing lactic acid, which makes muscles sore.
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