Which structure filters blood in the nephron?

Which structure filters blood in the nephron?

• A. Bowman's capsule
• B. Glomerulus
• C. Thyroid follicle
• D. Collecting tubules of the kidney

Answer: (B)

The main idea is where the actual blood filtration occurs in the nephron. The glomerulus is a tuft of capillaries inside the renal corpuscle that filters blood under pressure, producing a filtrate that enters Bowman's capsule. The filtration barrier—endothelial pores, the basement membrane, and podocyte foot processes—lets water, ions, glucose, and small waste molecules pass while keeping blood cells and large proteins in the bloodstream. Bowman's capsule simply surrounds the glomerulus and collects this filtrate; it doesn’t perform filtration itself. After that, the collecting tubules handle further processing and transport of urine. The thyroid follicle is not involved in kidney filtration.

The main idea is where the actual blood filtration occurs in the nephron. The glomerulus is a tuft of capillaries inside the renal corpuscle that filters blood under pressure, producing a filtrate that enters Bowman's capsule. The filtration barrier—endothelial pores, the basement membrane, and podocyte foot processes—lets water, ions, glucose, and small waste molecules pass while keeping blood cells and large proteins in the bloodstream. Bowman's capsule simply surrounds the glomerulus and collects this filtrate; it doesn’t perform filtration itself. After that, the collecting tubules handle further processing and transport of urine. The thyroid follicle is not involved in kidney filtration.