The renal pyramids are separated from each other by extensions of the renal cortex called ________.
a. renal medulla
b. minor calyces
c. medullary cortices
d. renal columns
The urinary system of the body governs the excretion of excess body fluid, electrolytes, and toxic molecules in the form of urine (the liquid waste of the body). Kidneys are the primary organ of the excretory system, and it is the site where urine is produced.
The kidney comprises three regions; the renal cortex, the renal medulla, and the renal pelvis. The medulla region comprises several renal pyramids, which consists of the kidney's functional unit, that is, the nephron. The renal pyramids are separated from each other by connective tissues known as renal columns; these connective tissues are extensions of the renal cortex.
Hence, the correct answer is the option 'd.'
Option 'a' is incorrect because the renal medulla is the region that contains renal pyramids.
Option 'b' is incorrect because the minor calyces are located on the renal pyramid's apex.
Option 'c' is incorrect because medullary cortices are not the extensions of renal cortex.
Hence, the medulla region of the kidney comprises several renal pyramids, which consists of the nephron. The renal pyramids are separated from each other by connective tissue extension of the renal cortex, known as renal columns.