Final answer:
The renal pelvis is the cavity within the kidney that collects urine before it passes to the ureter and then to the urinary bladder for storage.
So, the correct answer is B.
Step-by-step explanation:
The cavity within the kidney that collects urine is the renal pelvis. The renal pelvis is an important part of the urinary system, which includes the paired kidneys, the ureter, urinary bladder and urethra. Internally, the kidney is made up of three regions: an outer cortex, a medulla in the middle, and the renal pelvis, which is the expanded end of the ureter that collects urine from the calyces. The calyces are cup-like structures receiving urine from the collecting ducts, after which the urine passes on to the renal pelvis and then to the ureter.
The urinary bladder, on the other hand, is a hollow, muscular organ that collects and stores urine from the kidneys via the ureters. The bladder has ureteral openings through which urine enters from the ureters. The urine is eventually eliminated through urination when it leaves the bladder through the urethra. Therefore, when discussing the collection of urine within the kidneys before it is transported to the urinary bladder, the correct answer is the renal pelvis.
So, the correct answer is B.
Complete question:
The cavity within the kidney that collects urine is the:
a. tubules
b. renal pelvis.
c.urinary bladder.
d.Bowman's capsule.