Final answer:
The correct answer to the question is 'renal plexus', which is the network of nerves and ganglia that serves the kidneys. A nephron, which is not the correct answer in this context, is the kidney's functional unit including the renal corpuscle, renal tubule, and capillaries.
Step-by-step explanation:
The nerves and ganglia serving the kidney make up the renal plexus. The renal plexus is a network of nerve fibers that control the function and blood flow of the kidneys. This is in contrast to the nephron, which is the functional unit of the kidney made up of the renal corpuscle, the renal tubule, and the associated capillary network originating from the cortical radiate arteries. The nephron has three main components: firstly, the renal corpuscle which is comprised of a network of capillaries called the glomerulus and the Bowman's capsule which captures the filtered blood; secondly, the renal tubule which includes the proximal convoluted tubule, loop of Henle, and distal convoluted tubule; and thirdly, the capillary network associated with these structures which facilitates the filtration and reabsorption of substances in the kidneys.