Metabolism and Exercise
- Created by: India.02
- Created on: 01-05-19 19:17
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- Metabolism and Exercise
- Metabolism
- The sum of all reactions that happen in a cell or the body
- Large molecules broken down into smaller ones
- Glucose broken down in respiration - respiration transfers energy to power all reactions in the body that make molecules
- Excess protein broken down to produce urea - then excreted in urine
- Large molecules made from smaller ones
- Lipid molecules made from one molecule of glycerol and three fatty acids
- Glucose combined with nitrate ions to make amino acids - then into proteins
- Small glucose molecules joined together in reactions to form starch , glycogen and cellulose
- Exercise
- Respiration
- Muscles need to respire to contract - exercise makes muscles contract more frequently so more energy is needed - increased respiration
- Breathing volume and breath volume increase to get more oxygen into the blood - heart rate increases to get oxygenated blood around the body - removes carbon dioxide quicker
- Vigorous exercise means body can't supply enough oxygen - begin to respire anaerobically
- Lactic acid builds in muscles - painful
- Formed from incomplete oxidation of glucose
- Can also cause muscle fatigue - muscles get tired and stop contracting efficiently
- Lactic acid builds in muscles - painful
- Oxygen Debt
- Amount of extra oxygen your body needs to react with the build up of lactic acid and remove it from cells - oxygen reacts to form carbon dioxide and water
- Lungs, heart and blood couldn't keep up
- Heavy breathing to get more oxygen into the blood - transported to muscle cells
- Pulse and breathing rate stay high whilst there are high levels of lactic acid and carbon dioxide
- Blood can also enter muscles and transport lactic acid to the liver - converted back to glucose
- Investigate Effect of Exercise
- Take resting heart rate by holding two fingers on the inside of wrist or neck for 1 minute
- Take pulse after 5 minutes of sitting, walking, jogging and running
- Plot results on a bar chart - pulse increases with intensity of exercise as your body needs to get more oxygen to the muscles - to remove carbon dioxide
- To reduce errors - investigate as a group and calculate average
- Respiration
- Metabolism
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