Which statement best describes tubular reabsorption?

Correct answer: B. It returns useful substances from tubular fluid to the blood

  • A. It moves substances from blood into the nephron lumen
  • B. It returns useful substances from tubular fluid to the blood
  • C. It forms the initial filtrate from plasma in the glomerulus
  • D. It moves urine from the kidneys into the urinary bladder

Explanation

Tubular reabsorption returns water and needed substances such as glucose, amino acids and selected electrolytes from tubular fluid to the peritubular blood. Movement from blood into tubular fluid is tubular secretion, not reabsorption.

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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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