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NOTIFICATIONSWhy is a muscle like a motor bike?Although muscles and engines work in different ways, they both convert chemical energy into energy of motion.
Where does the energy for muscle contraction come from?The source of energy that is used to power the movement of contraction in working muscles is adenosine triphosphate (ATP) – the body’s biochemical way to store and transport energy. However, ATP is not stored to a great extent in cells. So once muscle contraction starts, the making of more ATP must start quickly. Since ATP is so important, the muscle cells have several different ways to make it. These systems work together in phases. The three biochemical systems for producing ATP are, in order:
Using creatine phosphateAll muscle cells have a little ATP within them that they can use immediately – but only enough to last for about 3 seconds! So all muscle cells contain a high-energy compound called creatine phosphate which is broken down to make more ATP quickly. Creatine phosphate can supply the energy needs of a working muscle at a very high rate, but only for about 8–10 seconds. Using glycogen (and no oxygen)Fortunately, muscles also have large stores of a carbohydrate, called glycogen, which can be used to make ATP from glucose. But this takes about 12 chemical reactions so it supplies energy more slowly than from creatine phosphate. It’s still pretty rapid, though, and will produce enough energy to last about 90 seconds. Oxygen is not needed – this is great, because it takes the heart and lungs some time to get increased oxygen supply to the muscles. A byproduct of making ATP without using oxygen is lactic acid. You know when your muscles are building up lactic acidbecause it causes tiredness and soreness – the stitch. Using aerobic respiration (using oxygen again)Within two minutes of exercise, the body starts to supply working muscles with oxygen. When oxygen is present, aerobic respiration can take place to break down the glucose for ATP. This glucose can come from several places:
Aerobic respiration takes even more chemical reactions to produce ATP than either of the above two systems. It is the slowest of all three systems – but it can supply ATP for several hours or longer, as long as the supply of fuel lasts. Nature of scienceA scientific theory provides the framework for scientists to make predictions about what they can observe and measure in investigations. The data collected can support or cast doubt on this theory. Here’s how it worksYou have missed the bus and start running to college for a 9.00am exam:
Different forms of exercise use different systems to produce ATPA sprinter is getting ATP in a very different way to a marathon runner.
Explore this further in the article Marathon versus sprint. Activity ideasIn Finger marathon students investigate muscle fatigue using the action of opening and closing a clothes peg. In Calculating RMR and daily energy output students calculate their RMR (resting metabolic rate) and use this to calculate the energy cost of various activities. Would you like to take a short survey?This survey will open in a new tab and you can fill it out after your visit to the site. What involves activities in which the muscles produce energy without using oxygen?Introduction. Anaerobic exercise is any activity that breaks down glucose for energy without using oxygen. Generally, these activities are of short length with high intensity.
What is it called when you exercise without oxygen?Anaerobic exercise involves short, fast, high-intensity exercises that don't make your body use oxygen like it does for cardio (or aerobic) activities. Instead, anaerobic activities break down glucose that's already in your muscles for a form of energy.
What type of exercise requires the use of oxygen in a muscle energy generating process?Aerobic exercise refers to the type of repetitive, structured physical activity that requires the body's metabolic system to use oxygen to produce energy.
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