Question

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

Explanation:

Tubular reabsorption is a key process in the nephron (the functional unit of the kidney). After the initial filtration of blood in the glomerulus (forming filtrate), the filtrate moves through the renal tubules. In the tubules, essential substances like glucose, amino acids, water, and electrolytes (e.g., sodium, potassium) are re - absorbed back into the bloodstream. This is not about breaking down substances (as in digestion - like processes in the body), not about just allowing substances through a membrane (which is more related to filtration at the glomerulus), not about removing waste products (that is more related to secretion in some parts of the tubule and final excretion), and not about secreting essential substances into the filtrate (secretion usually involves adding some substances to the filtrate for excretion).

Answer:

Process of recovering essential substances from filtrate.