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Anaerobic Cellular Respiration Anaerobic = without oxygen
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Anaerobic Cellular Respiration During Glycolysis, energy is obtained without oxygen. This type of energy production is called Fermentation. Fermentation occurs without oxygen.
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Fermentation Bacteria species engage in a host of specific fermentation processes. Eukaryotic organisms engage in 2 types of fermentation. Eukaryotes: have a nucleus This section will focus on these 2 types of fermentation.
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Eukaryotic Fermentation Both methods of fermentation have 2 steps. Step 1: Glycolysis Step 2: fermentation (accomplished by recycling the products of glycolysis).
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Alcohol Fermentation Common in yeast. Acetaldehyde is produced when carbon dioxide was removed from pyruvate by the enzyme pyruvate decarboxylase. NADH passes Hydrogen Atoms to acetaldehyde. This generates carbon dioxide, ethanol, and NAD+. The NADH was a product of glycolysis.
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Alcohol Fermentation The alcohol ethanol is produced as a result. (alcohol found in alcoholic drinks.) The process recycles NAD+, therefore, glycolysis can continue. 2 ATP produced in glycolysis satisfy energy needs. Ethanol and Carbon dioxide are released as wastes.
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Alcohol Fermentation
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Applications of Alcohol Fermentation Fermentation is commonly used by humans. Breads, pastries, wine, beer, liquor, and soy sauce are all produced by fermentation.
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Bread Yeast is added which will undergo fermentation. The bread will rise due to the release of Carbon dioxide. Alcohol is also produced Can you get drunk by eating bread? Alcohol is produced, but it evaporates upon baking. Don’t try to eat dough to get drunk!! It will make you sick not drunk.
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Wine Yeast ferments sugar of fruit juice (Grape juice). Mixture bubbles due to carbon dioxide. At 12% alcohol concentration yeast cells die.
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Homemade Root beer Is Homemade Root beer Alcoholic? Fermentation generates alcohol as a waste products, So the answer is Yes. Homemade Root Beer is about 0.5% alcohol. A Beer is about 6% alcohol. You won’t be able to drink the necessary volume of liquid to get drunk.
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Homemade Root beer
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Lactic Acid Fermentation During strenuous exercise, the muscles energy demands are greater than aerobic respiration can supply. Additional ATP is supplied by lactic acid fermentation See Figure 5 page 224.
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Lactic Acid Fermentation NADH made in glycolysis transfers H atoms to pyruvate to make lactic acid and NAD+ Formation of NAD+ allows glycolysis to continue. Accumulation of lactic acid leads to muscle stiffness/ soreness, and fatigue. Lactic acid is transported to the liver and converted to pyruvate when vigorous exercise ceases.
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Lactic Acid Fermentation Pyruvates then go through aerobic respiration Extra oxygen in necessary to process lactic acid. (oxygen debt) Panting accompanying hard exercise is the bodies way to pay off the oxygen debt.
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Exercise Physiology The branch of biology that studies the bodies biological responses to exercise. Most common problem encountered by athletes? Shortage of energy.
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Aerobic Fitness A measure of the capacity of the heart, lungs, and bloodstream to provide oxygen to the cells of the body during exercise. Aerobic fitness is one of the major factors to consider when assessing an individuals overall fitness level.
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Other Factors Muscle Strength Muscular Endurance Flexibility Body composition
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VO2 Max Maximum volume of oxygen that the cells can remove from the bloodstream in 1 min/kg of body mass at maximum exertion. mL/kg/min
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Assessing VO2 max Treadmill test Person forced to go faster and faster while expired air is collected and measured by a computer. Lasts about 10 to 15 minutes.
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VO2 Max High VO2 max = better aerobic fitness. Figure 8 page 225.
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2 Components to VO2 Max Exercise and Genetics. When an individual increases there levels of exercise, their VO2 max will generally increase as well. Genetic composition plays a part as well. This is why some people are elite marathon runners and some are not. VO2 max also decreases with age.
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Lactic Acid Threshold Value of exercise intensity at which lactic acid production increases Leads to sore muscles, increased pain, and fatigue. Exercising below lactic acid threshold = longer duration of exercise PACE YOURSELF!!!!
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Lactic Acid Threshold Untrained person has a lactic acid threshold at about 60% of VO2 max Trained person has a lactic acid threshold at about 80% of VO2 max.
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Environmental Factors and Cellular Respiration Environmental Factors can have an influence on cellular respiration. Two examples are Supplements and Toxins
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Supplements Buffers: counteract the acidic nature of lactic acid and will allow an athlete to have enhanced performance for a short period of time. Creatine: contains a phosphate that is donated to ADP to allow for the creation of more ATP. Net effect: more energy available for the muscles to use. Long term side effects not well understood at this point.
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Toxins Some environmental substances will influence cellular respiration either indirectly or directly.
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Indirect Influence Carbon monoxide binds at the oxygen receptor sites of the bodies hemoglobin. Oxygen is not available to drive the ETC. Cell Death follows.
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Direct Influence Cyanide and hydrogen sulfide act directly on a specific rxn within the respiration pathway.
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Summary
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