5.1 Cellular Respiration

Cellular Respiration

-Energy from food is used to creat ATP

-Aerobic resp takes place in the presence of oxygen, anaerobic resp takes place in the absence of oxygen

-ATP cannot be stored in the body in large amounts, but products to make it are always available

-rigor mortis= when cellular resp and ATP production ends, proteins cannot be made + muscles cannot contract

-Aerobic resp takes place in 2 phases --> glycolysis when oxygen is not used and krebs/link/ ETC where oxygen is used

-Glycolysis takes place in cytoplasm

-Link/krebs/ETC take place in mitochondria

Mitochondria + cellular respiration

-Matrix contains the enzymes of the krebs cycle

-Cristae carry the stalked particles associated with ATP synthesis

-Cells with low energy requirement  contian fewer mitochondria than those with high energy requirements

Glycolysis

-means sugar splitting

-glucose is broken down to produce pyruvate which is a substrate for the link reaction

-first step= ATP used to phosphorylate the glucose, making it unable to leave the cell + more reactive

-second step= phosphorylated 6C sugar is broken down into 2x GP. NADH is produced by removing H from 3C sugars, reducing NAD to NADH, which travels to the ETC in the mitochondrial membrane

-third step= 2x GP becomes 2x pyruvate. Phosphorylation is reversed, and the phosphate released is used to produce ATP

- 8x ATP can be produced when pyruvate can go…