A nurse teaches a patient about normal urine formation. Which statement shows correct understanding?

Correct answer: B. Reabsorption returns selected substances to the blood

  • A. Filtration moves substances from tubules into the blood
  • B. Reabsorption returns selected substances to the blood
  • C. Secretion moves all plasma proteins into urine
  • D. Excretion occurs before filtration in the nephron

Explanation

Tubular reabsorption returns needed water and solutes from the tubular fluid to the blood. Filtration occurs first at the glomerulus, while secretion adds selected substances to tubular fluid before final excretion.

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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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