Dietary protein must be consumed daily because nitrogen is lost in __________. Group of answer choices urine and feces sweat breath anabolic processes
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3. Within a few days after a fast begins, nitrogen excretion accelerates to a relatively high level. After a few weeks, the rate of urea excretion falls to a lower level. The excretion of nitrogen then continues at a relatively constant rate until the body is depleted of triacylglycerol stores when the rate of urea and ammonia excretion again rises to a very high level. a. Describe the events that trigger and the purpose of the initial surge of nitrogen excretion? Include the hormones and metabolic pathways that are involved. b. Why does the nitrogen excretion rate decrease after several weeks of starvation? c. Explain the increase in nitrogen excretion that occurs when lipid stores are depleted?
Fuel choice. Within a few days after a fast begins, nitrogen excretion accelerates to a higher-than-normal level. After a few weeks, the rate of nitrogen excretion falls to a lower level and continues at this low rate. However, after the fat stores have been depleted, nitrogen excretion rises to a high level. (a) What events trigger the initial surge of nitrogen excretion? (b) Why does nitrogen excretion fall after several weeks of fasting? (c) Explain the increase in nitrogen excretion when the lipid stores have been depleted.
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