Each kidney contains about a million microscopic filtering units called?

• A. Lymphs
• B. Nephrons
• C. Tubes
• D. Ureters

Answer: (B)

The main idea is that the kidney’s filtering power comes from its functional units called nephrons. Each kidney contains about a million nephrons, which are responsible for filtering blood, reabsorbing essential substances, and forming urine. A nephron includes the glomerulus, where filtration begins, plus a tubular system (Bowman’s capsule, proximal tubule, loop of Henle, distal tubule, and collecting duct) that reprocesses what the body needs and disposes of what it doesn’t. The other options don’t fit this role: lymphs are immune cells, tubes is too vague, and ureters are just the tubes that transport urine to the bladder. So nephrons are the precise term for the kidney’s microscopic filtering units.