Biological Systems MCAT Practice Exam 2025 – Complete Study Resource

Question: 1 / 400

Which process in urine formation involves the reassessment of water and solutes back into the blood?

Filtration

Selective reabsorption

Selective reabsorption is the correct answer as it specifically refers to the process during urine formation where the kidneys reabsorb water and essential solutes from the renal tubules back into the bloodstream. After initial filtration in the glomerulus, the filtrate, which contains both waste products and essential nutrients, enters the renal tubules. Here, selective reabsorption plays a crucial role in maintaining homeostasis by ensuring that vital substances such as glucose, amino acids, and ions are returned to the blood while waste products remain in the filtrate to be excreted as urine.

This process is essential for regulating the body’s fluid balance and electrolyte levels, which are crucial for overall health. The kidneys adjust the amount of water and solutes reabsorbed according to the body's needs, often influenced by hormones such as antidiuretic hormone (ADH) and aldosterone.

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Secretion

Concentration

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