140 likes | 177 Views
Exercise Physiology. APL2/L3. Adenosine Triphosphate Energy storing molecule “usable energy”. Our Body’s “gasoline”. 1. ATP (6 sec): stored in mitochondria. 2. CP : Creatine phosphate (10 sec) A lot of it in muscles and builds ATP back up.
E N D
Exercise Physiology APL2/L3
Adenosine Triphosphate Energy storing molecule “usable energy” Our Body’s “gasoline”
1.ATP (6 sec): stored in mitochondria. 2. CP: Creatine phosphate (10 sec) A lot of it in muscles and builds ATP back up. (Creatine phosphate + ADP ↔ ATP + creatine) 3. Glycogen: stored glucose in liver and muscles.(anaerobic) Fat: used last. Greatest potential energy source. Energy Pathways (3)
Cellular Respiration: • Process which releases energy from organic compounds in cells. • 3 reactions: glycolysis, citric acid cycle (Krebs), electron transport chain • RESULT: CO2, H2O and energy. ½ IS HEAT, ½ IS USED TO MAKE ATP (ENERGY NEEDED BY MUSCLE CELLS)
Glycolysis: • Breaking of glucose: 6-carbon glucose molecule→two 3-carbon pyruvic acid molecules. • High energy electrons are delivered to ETC • 2 molecules ATP produced
Part II of Aerobic Respiration Charged Ions are produced and gotten ready for ETC. 2 ATP produced Krebs cycle
ATP • Between ETC and Krebs Cycle: 34 molecules of ATP are produced. • A lot of heat is given off
Muscle fatigue and Oxygen Debt • Normally, we breath enough O2 to support aerobic use of glucose. However… • Strenuous use of muscles result in: anaerobic respiration: glucose is broken into pyruvic acid → lactic acid • Lactic acid: not enough ATP to convert it to glucose at this time. • Results in: O2 debt= muscle cramping/fatigue
Hypertrophy of Muscles • Muscles forcefully exercised will enlarge • There is ↑ in muscle fiber size, not number of muscles. • i.e: body builder/weight -lifter, prof. athlete
Atrophy of Muscles • Muscles not used will decrease in size • This is called muscle atrophy • i.e: spinal cord patients: very thin and frail
Quick Quiz (2 pts/bullet) • What is gasoline for our body? • What are the 3 energy pathways in the cell? • What 3 reactions make up cellular respiration and what do they produce? • When does anaerobic respiration occur? • How do muscles enlarge? What is increased muscle mass called?