Bellwork 10/26 Weds **Reminder: quiz this Friday, test next friday 1.How many total calories are there? 2.How many calories from sugar (hint: grams of sugar x 4cal/g) 3. What is the percentage of calories from sugar? (hint: sugar calories / total calories) Agenda: Lab first, then notes

Cellular Respiration Lab Important: Use the same person for all 3 trials Make sure you are ready to do the trial before doing you exercise Blow at a light, steady pace. The object is not to blow as many bubbles as fast as possible Cleanup: dispose all BTB (blue liquid) into the bins, not the sink! –Rinse you flask and graduated cylinder out with water and return to your station

1)Cellular Respiration -How your body makes energy! Glucose is broken down to smaller molecules 36 ATP is made –For each glucose C 6 H 12 O 6 + O 2 → 36 ATP + H 2 O + CO 2 (glucose) Starting Materials → Products

Fermentation Also used by living things to make energy! More primitive than Cellular Resp. –Makes less ATP (energy) :( 2 types: 1. Alcohol Fermentation glucose → 4 ATP + alcohol + CO 2 Bacteria and yeast make energy this way Yeast make beer, wine, bread

2. Lactic Acid Fermentation glucose → 4 ATP + lactic acid + CO 2 Used by plant & animal cells if O 2 is low Used by muscle cells during strenuous exercise Lactic acid is “the burn” –makes muscles sore the next day

Why do you die without O 2 ? –Brain cells can’t live on 4 ATP from Fermentation

2 types of exercises: –Aerobic exercise: O 2 level high muscles can use Cell. Resp. best for weight loss

–Anaerobic exercise: O 2 level low muscles must use Fermentation for body building & stamina