Question

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what is tubular reabsorption?
process of removing waste products from filtrate.
process of recovering essential substances from filtrate.
process of secreting essential substances into the filtrate.
process of allowing substances to pass through the filtration membrane.
process of breaking down essential substances in filtrate.

Explanation:

Tubular reabsorption is a key process in the nephron (the functional unit of the kidney). After the formation of filtrate in the glomerulus (glomerular filtration), the filtrate moves into the renal tubules. Tubular reabsorption involves the movement of essential substances (such as glucose, amino acids, water, and electrolytes like sodium, potassium) from the filtrate back into the peritubular capillaries (blood). This is crucial for maintaining the body's internal environment (homeostasis) by preventing the loss of important substances in the urine.

• The option "Process of removing waste products from filtrate" is incorrect. Removing waste products from the filtrate is more related to secretion (tubular secretion) rather than reabsorption.
• The option "Process of secreting essential substances into the filtrate" is wrong. Secretion typically involves adding substances (often waste products or excess ions) to the filtrate, not re - absorbing essential substances.
• The option "Process of allowing substances to pass through the filtration membrane" describes glomerular filtration (the first step in urine formation where blood is filtered through the glomerular filtration membrane into the Bowman's capsule to form filtrate), not reabsorption.
• The option "Process of breaking down essential substances in filtrate" is not relevant. There is no such general process of breaking down essential substances in the context of tubular reabsorption.

Answer:

Process of recovering essential substances from filtrate.