Question

unit 3 - challenge 3.3: the urinary sys
which blood vessels filter the blood based on particle size?
a.) vasa recta
b.) peritubular capillaries
c.) glomerulus
d.) efferent arterioles
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Explanation:

The glomerulus is a network of capillaries in the kidney. It filters blood based on particle size. Small particles like water, salts, glucose, and urea pass through the glomerular filtration membrane into the Bowman's capsule to form filtrate. Larger particles like blood cells and large proteins are retained in the blood.

• Vasa recta: It is involved in maintaining the concentration gradient in the medulla for urine concentration, not filtration based on particle size.
• Peritubular capillaries: They are involved in reabsorption and secretion processes in the renal tubules, not the initial filtration based on particle size.
• Efferent arterioles: They carry blood away from the glomerulus. Their main role is in regulating the glomerular filtration rate by adjusting their diameter, not in the actual filtration based on particle size.

Answer:

C. Glomerulus