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camosloppy3150
07.10.2019 •
Biology
Where is the oxygen debt being built up? walking, sprinting or standing?
where is the oxygen debt being paid off? walking, sprinting or standing?
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Ответ:
Lactic Acid
During such periods, additional ATP is generated by anaerobic glycolysis. In the process, most of the pyruvic acid produced is converted to lactic acid. Although about 80% of the lactic acid diffuses from the skeletal muscles and is transported to the liver for conversion back to glucose or glycogen.
Oxygen
Ultimately, once adequate oxygen is available, the lactic acid must be catabolized completely into carbon dioxide and water. After exercise has stopped, extra oxygen is required to metabolize lactic acid; to replenish ATP, phosphocreatine, and glycogen; and to pay back any oxygen that has been borrowed from hemoglobin, myoglobin (an iron-containing substance similar to hemoglobin that is found in muscle fibres), air in the lungs, and body fluids.
The additional oxygen that must be taken into the body after vigorous exercise to restore all systems to their normal states is called oxygen debt (Hill 1928)[1].
Eventually, muscle glycogen must also be restored. This is accomplished through diet and may take several days, depending on the intensity of exercise. The maximum rate of oxygen consumption during the aerobic catabolism of pyruvic acid is called "maximal oxygen uptake". It is determined by sex (higher in males), age (highest at about age 20) and size (increases with body size).
Highly trained athletes can have maximal oxygen uptakes that are twice that of average people, probably owing to a combination of genetics and training. As a result, they are capable of greater muscular activity without increasing their lactic acid production, and their oxygen debts are less. It is for these reasons that they do not become short of breath as readily as untrained individuals.
Oxygen consumption following exercise
After a strenuous exercise there are four tasks that need to be completed:
Replenishment of ATP
Removal of lactic acid
Replenishment of myoglobin with oxygen
Replenishment of glycogen
The need for oxygen to replenish ATP and remove lactic acid is referred to as the "Oxygen Debt" or "Excess Post-exercise Oxygen Consumption" (EPOC) - the total oxygen consumed after exercise in excess of a pre-exercise baseline level.
In low-intensity, primarily aerobic exercise, about one half of the total EPOC takes place within 30 seconds of stopping the exercise and complete recovery can be achieved within several minutes (oxygen uptake returns to the pre-exercise level).
Recovery from more strenuous exercise, which is often accompanied by an increase in blood lactate and body temperature, may require 24 hours or more before re-establishing the pre-exercise oxygen uptake. The amount of time will depend on the exercise intensity and duration.
Ответ:
Stratovolcano
Sakurajima, a stratovolcano on the the island of Kyushu, is one of the most active volcanoes on Earth. Since it's first recorded eruption in A.D. 708, Sakurajima has been in nearly constant eruption.