Which change would most directly reduce glomerular filtration in a healthy kidney?
Correct answer: B. Moderate constriction of the afferent arteriole
- A. Moderate dilation of the afferent arteriole
- B. Moderate constriction of the afferent arteriole
- C. Increased permeability of the filtration membrane
- D. Increased blood flow into the glomerulus
Explanation
Constriction of the afferent arteriole reduces blood flow and pressure entering the glomerulus, so filtration falls. Afferent dilation and increased glomerular blood flow generally support filtration.
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About Urinary System
The urinary system includes the kidneys, ureters, urinary bladder and urethra, with emphasis on nephron structure and urine formation. It explains glomerular filtration, tubular reabsorption, tubular secretion, water and electrolyte regulation, acid base balance, and the roles of ADH and aldosterone in maintaining homeostasis.
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