Cellular Respiration Chapter 4, sections 1 and 4-6

What Is ATP? Stands for adenosine triphosphate Is the cell’s energy currency Clip – 2:26

How Do We Get Energy From ATP? By breaking the high-energy bonds between the phosphate groups

When is ATP Made in the Body? During a process called cellular respiration that takes place in both plants & animals clip – 1:54

Cellular Respiration Includes pathways that require oxygen So cellular respiration is often referred to as aerobic respiration Breakdown of one glucose results in 36 to 38 ATP molecules Animation (“The Big Picture”)

What are the Stages of Cellular Respiration? Glycolysis The Krebs Cycle The Electron Transport Chain Animation

Where Does Cellular Respiration Take Place? It actually takes place in two parts of the cell: Glycolysis occurs in the cytoplasm Krebs Cycle & ETC occur in the mitochondria

Glycolysis Summary Takes place in the cytoplasm Anaerobic (doesn’t use oxygen) Requires input of 2 ATP; this is considered the energy-investment phase

With Oxygen….Or Without If oxygen is present, the end product of glycolysis will go to mitochondrion for the rest of cellular respiration and produce LOTS of energy If oxygen is not present, then the end product of glycolysis will enter fermentation Muscle cells enter lactic acid fermentation Yeast enters ethanol fermentation

With Oxygen – Krebs Cycle & Electron Transport Chain CO2 is produced in the Krebs Cycle 2 ATP are also formed in the Krebs Cycle Animation – go to “Krebs Cycle” Electron Transport Chain 34 ATP produced in ETC H2O is electron acceptor (you breathe this out) Animation – go to “Electron Transport Chain”

Electron Transport Chain Review of Cellular Respiration – 6:01