alleryStart learning →The glomerular tuft formed by the afferent arteriole measures about what across?
AAbout 20 micrometres
BAbout 70 micrometres
CAbout 200 micrometres
DAbout 700 micrometres
Answer & Solution
Correct answer: C. About 200 micrometres
1. The afferent arteriole opens into a knot of high-pressure capillaries about 200 micrometres in diameter.
2. That knot is the glomerulus, the first part of the nephron.
3. Its high pressure is what drives filtrate across into the surrounding capsule.
4. The 70 nanometre figure belongs to the pores of the filtration membrane, a scale far smaller than the tuft itself.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 25 "The Urinary System", section 25.3 Gross Anatomy of the Kidney_
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