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Do³±czy³: 16 Mar 2016
Posty: 15
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 What Changes Happen During Exercise |
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salomon snowcross While all of your body's systems are impacted in one way or another during exercise, the key players are the lungs, the cardiovascular system and the muscles. When you exercise, the demand for fuel in the form of glucose and fat goes up, along with the demand for oxygen to convert those fuels to energy. As energy is produced, waste products in the form of carbon dioxide and other metabolites must be cleared from the cells via your circulatory system.
Muscle Cell Metabolism
Regardless of what type of exercise you are doing, the capacity for your muscles to repeatedly contract depends on the ability of your muscle cells to regenerate adenosine triphosphate, or ATP. During short duration activities at a very high intensity, your muscles draw on phosphocreatine and glucose stored in the cell to make ATP. The capacity for your cells to make ATP without oxygen is limited to about two minutes. After that, your muscles will fatigue. During longer duration activities at low to moderate intensities, organelles called mitochondria, located within the muscle cell, are able to use oxygen to convert glucose and fat to ATP. This can go on for two hours or more, provided ample oxygen is available, because you will draw on your fat stores for fuel.
The Heart and Lungs
salomon outban In order to meet the demand for ATP during exercise, your body responds with an increased respiratory rate, bringing more oxygen into the lungs. The oxygen attaches to the protein hemoglobin contained in red blood cells In the alveoli of the lungs and is carried via the circulatory system to the heart. Your heart, in turn, beats faster and with greater force to pump the blood into the peripheral circulation to be delivered to the muscle cells. There, oxygen is extracted and taken into the mitochondria to make ATP. In exchange, the blood picks up carbon dioxide and carries it to the lungs to be expired. Other metabolites are also removed, to be eventually eliminated through your kidneys.
Blood Pressure
puma shoes for women Your blood pressure naturally goes up during exercise as your heart pumps faster and harder to deliver oxygenated blood to your muscles. This rise in blood pressure works on the same premise as the plumbing in your home. When you open a faucet or spigot all the way, the water comes out in greater volume and with greater force. The same is true of the pressure on the walls of your arteries, as a greater volume of blood is pumped through with greater force. When you stop exercising, your blood pressure quickly returns to pre-exercise levels.
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