Q: What is the cause of the striated appearance of the pyramids in the kidney?  

Answer: B

The striated appearance of the pyramids in the kidney is caused by the presence of bundles of micro-tubules that run parallel to each other. These micro-tubules are part of the cells that make up the walls of the renal tubules and are involved in the transport of fluid and solutes through the kidney. The striations are most visible in the outer part of the medulla, which is composed of the pyramids and the tissue between them. The parallel arrangement of the micro-tubules gives the pyramids a distinct appearance and is an important feature in the structure and function of the kidney.

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