Kidney Anatomy: Identifying the Cup-Shaped Structure
The question asks to identify a specific structure within the kidney that is cup-shaped and located at the beginning of a coiled tube. This structure is a key component of the nephron, the functional unit of the kidney.
Analyzing Kidney Structures
Let's examine the options provided:
- Collecting duct: This tube receives fluid from multiple nephrons and is involved in concentrating urine. It is not typically described as cup-shaped at its origin point in relation to a coiled tube.
- Loop of Henle: This U-shaped tubule extends from the proximal convoluted tubule and dips down into the medulla before returning. Its shape is distinct from a cup.
- Bowman’s capsule: This is a double-walled, cup-shaped structure that completely surrounds the glomerulus. It forms the beginning of the renal tubule, which then becomes coiled (the proximal convoluted tubule). This matches the description precisely.
- Glomerulus: This is a network of capillaries located inside Bowman's capsule. While it is a distinct structure, it is the capillaries themselves, not a cup-shaped structure surrounding them.
Conclusion on Kidney Structure
Based on the anatomical description, Bowman’s capsule is the structure that is cup-shaped at one end of the coiled tube (the beginning of the nephron tubule).
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