Final answer:
The term used for the tip of a pyramid in the kidney is 'apex'. The renal cortex is the outer layer where nephrons are located, whereas the renal medulla contains the renal pyramids and their apices.
Step-by-step explanation:
The term used for the tip of a pyramid in the kidney is apex. Each kidney contains multiple renal pyramids, and the apex of these pyramids points towards the renal sinus. The renal pyramids are found within the renal medulla, and their apices (plural for apex), known as renal papillae, drain into minor calyces. From there, the urine flows into major calyces, and then into the renal pelvis, which in turn drains into the ureter.
The renal cortex is the outer layer of the kidney and it is where the nephrons, the functional units of the kidney, are primarily located. The medulla is the inner part of the kidney and contains the renal pyramids and tubules that lead to the renal papillae.
In relation to the statement presented, the term apex properly describes the pointed end of a renal pyramid within the kidney, corresponding to answer choice a).