Final answer:
Nephrons are the functional parts of the kidney present in the greatest numbers, with cortical nephrons constituting about 85% of them.
Step-by-step explanation:
The functional part of the kidney that is present in the greatest numbers is the nephron. Each kidney contains more than a million nephrons that filter blood and generate urine through a complex process involving a renal corpuscle, renal tubule, and associated capillary network. Out of these, cortical nephrons make up about 85% and are mostly located deep in the renal cortex, whereas juxtamedullary nephrons comprise about 15% and are found in the renal cortex close to the renal medulla.
The functional part of the kidney that is present in the greatest numbers is called the nephron. Each kidney is made up of over one million nephrons, which are the structural and functional units of the kidney. The nephron consists of three parts: a renal corpuscle, a renal tubule, and the associated capillary network.