Define nitrogen balance. List three factors that might lead to negative nitrogen balance and three that might result in positive nitrogen balance.
What will be an ideal response?
Nitrogen balance is a state when the amount of nitrogen ingested in proteins equals the amount of nitrogen excreted in urine and feces. Factors leading to negative nitrogen balance, when protein breakdown exceeds the use of protein for building structural or functional molecules, include physical and emotional stress, poor-quality dietary protein, and starvation. Factors leading to positive nitrogen balance, when the rate of protein synthesis is higher than the rate of its breakdown and loss, include the normal condition in growing children and pregnant women, periods of rebuilding or repair following illness, and site-specific regeneration following injury.
You might also like to view...
Peristaltic waves are ________.
A) segmental regions of the gastrointestinal tract B) churning movements of the gastrointestinal tract C) pendular movements of the gastrointestinal tract D) waves of muscular contractions that propel contents from one point to another
What is the primary function of the vasomotor center of the medulla oblongata?
A) increases cardiac output through sympathetic innervation B) reduces cardiac output through parasympathetic innervation C) monitors the chemical composition of blood D) monitors the degree of stretch in the walls of expandable organs E) controls the diameters of arterioles through sympathetic innervation
When large quantities of blood are lost, erythrocytes must be replaced to restore
A. thrombin levels. B. the body's ability to fight infection. C. oxygen-carrying capacity. D. iron levels. E. normal blood pH.
Which of the following structures is composed of a theca folliculi, granulosa cells, a zona pellucida, and a secondary oocyte?
A. Primary follicle B. Tertiary follicle C. Corpus albicans D. Secondary follicle E. Corpus luteum