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B
Respiratory system
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C
Reproductive system
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D
Digestive system
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Solution
The correct option is A Excretory system The nephrons are the functional unit of excretory organs, i.e., kidneys. Each nephron has two parts the glomerulus and the renal tubule. The renal tubule begins with a double walled cup-like structure, called as Bowman's capsule, which encloses the glomerulus.
Glomerulus along with Bowman's capsule is called as the Malpighian body or renal corpuscle. The tubule continues further to form a highly coiled network proximal convoluted tubule (PCT).
A hairpin-shaped Henle's loop is the next part of the tubule, which has a descending and an ascending limb. The ascending limb continues as another highly coiled tubular region, called as distal convoluted tubule (DCT).
The DCTs of many nephrons open into a straight tube called as collecting duct, many of which converge and open into the renal pelvis through medullary pyramids in the calyces.