A. The bicarbonate, phosphate, and protein: The major chemical buffer systems in the body are the bicarbonate, phosphate, and protein buffer systems.
Glucose is not a buffering system; it is a primary energy source.
Magnesium is a mineral with various physiological roles but not a major chemical buffer system.
Creatinine is a waste product of muscle metabolism, not a buffer system.
The Correct Answer is C
A. Tubuloglomerular feedback involves the macula densa sensing changes in sodium chloride concentration and adjusting the glomerular filtration rate (GFR) via the juxtaglomerular apparatus.
B. Renal autoregulation includes mechanisms like the myogenic mechanism and tubuloglomerular feedback that maintain stable GFR despite blood pressure changes. This option is too broad and not specific to the mechanism described.
C. The myogenic mechanism refers to the smooth muscle's tendency to contract when stretched, helping to stabilize GFR by adjusting the diameter of the afferent arterioles. This is the correct answer.
D. Sympathetic control influences renal blood flow and GFR through hormonal and nervous system regulation, but it is not the specific mechanism described in the question.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is True
Explanation
ADH is secreted by the posterior pituitary gland, not the kidneys. The kidneys respond to ADH by conserving water and concentrating urine, but they do not produce or secrete ADH.
Correct Answer is False
Explanation
The large intestine absorbs water, fats, and salts.
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