Urinary & Reproductive Systems
Part 1 of 2: The Urinary System. This unit runs past the 40-minute ceiling, so it ships in 2 lectures.
The narration between entries paraphrases; it never reads an entry aloud before the entry plays. Every entry in this lecture plays exactly as it does on its own page — same file, same speed, nothing laid over it.
What you can do after this
- Give both combining forms for the kidney, and say why the course keeps both
- Tell pyel from py, and say what the one-letter difference changes
- Tell the ureter from the urethra by what each one connects
- Tell the suffix lysis from the suffix tripsy by whether the breaking is deliberate
- Say what dialysis names, and what belongs to clinical training instead
What it covers
15 entries in 7 topics. Each number links to that entry on its own.
-
1. One organ, two languages
-
2. Inside the kidney, and a one-letter trap
-
3. The two tubes
-
4. The bladder, twice over
-
5. Urine, and the suffix that describes it
-
6. Two ways of breaking something
-
7. Two named processes
Check yourself
What are the two combining forms for the kidney, and why does the course keep both?
Ren slash o, from Latin, and nephr slash o, from Greek. Both are standard and both are in daily clinical use — renal failure and nephrology are equally correct terms. The course keeps both because neither root replaces the other inside a term that already uses it: the established term dictates which root appears, so a reader who knows only one form will fail to decode roughly half the kidney vocabulary.
How do pyel and py differ, and why does it matter?
Pyel slash o names the renal pelvis, the funnel-shaped basin that collects urine inside the kidney. Py slash o names pus. They differ by two letters, and the shorter form is not an abbreviation of the longer one — one names a structure and the other names a substance. It matters because no rule in the decoding method separates them: pyelonephritis and pyuria are built the same way and mean unrelated things, so this pair has to be memorised rather than derived.
How do the ureter and the urethra differ?
By what each connects. A ureter carries urine from a kidney to the bladder, and there are two of them, one per kidney. The urethra carries urine from the bladder out of the body, and there is one. Their names differ by a single syllable and sound alike enough to be confused in dictation, so the reliable test is direction and count rather than spelling.
How do the suffixes lysis and tripsy differ?
By whether anyone intended the breaking. Lysis names a breakdown, separation or destruction that occurs — hemolysis is the breakdown of red blood cells, which happens rather than being performed. Tripsy names surgical crushing that somebody carries out, as in lithotripsy, the crushing of a stone. Both describe something coming apart; only one describes a procedure.
What does dialysis name, and what does the term deliberately not cover?
The filtering of waste from the blood by a means other than the kidneys. It decodes cleanly from parts already taught: the prefix dia names through and the suffix lysis names separation, so the term is filtering-through. What the term does not carry is any clinical content — when dialysis is indicated, how it is delivered, or what it treats belongs to clinical training rather than to terminology, and the entry stops at the process deliberately.
Lecture transcript
The narration as recorded, in order. Where an entry plays, the transcript links to it rather than reprinting it — the entry plays from its own file, unaltered, and says the same thing on its own page.
This is Unit Eleven of Medical Terminology, Part One: the urinary system. Fifteen entries, and almost all of the difficulty in them is confusion between pairs. That is not an accident of this unit. It is what happens when one body system inherits vocabulary from two languages and then adds suffixes that differ by a single letter. The kidney arrives twice, once from Latin and once from Greek, and both forms are standard. Neither replaces the other in a term that already uses it — renal failure and nephrology are both correct, and neither can be rewritten with the other root. Then a trap worth arriving ready for. The form naming the renal pelvis and the form naming pus differ by two letters, and the shorter one is not an abbreviation of the longer. One names a structure; the other names a substance. The two tubes are the second trap. One runs from a kidney to the bladder, the other from the bladder out of the body, and their names differ by one syllable in the middle. What separates them is not spelling but direction. By the end you will be able to do five things. One: give both kidney forms and say why both survive. Two: tell pyel from py. Three: tell the ureter from the urethra. Four: tell lysis from tripsy. Five: say what dialysis names.
Two entries and one organ. Unit One's rule that a structure can carry roots from two languages is not an exception here — it is the first thing the urinary system does, and both forms are in daily use.
The Latin root.
MedTerm 0661 ren/o: Kidney
The combining form ren slash o names the kidney and comes from Latin. Renal failure is loss of kidney function. A second combining form also names the kidney and comes from Greek, so meeting one form does not mean the other will not appear.
The Greek root.
MedTerm 0662 nephr/o: Kidney
The combining form nephr slash o also names the kidney, and comes from Greek. Nephritis is inflammation of the kidney. Renal and nephrology are both standard, and neither root replaces the other in a given term — the term decides which root it takes, not the speaker.
Three entries. The first names a basin inside the kidney; the second names pus and differs from it by two letters; and the third carries a plural rule from Unit One that most readers meet here for the first time in practice.
The basin.
MedTerm 0663 pyel/o: Renal Pelvis
The combining form pyel slash o names the renal pelvis, the funnel-shaped basin that collects urine inside the kidney. Pyelonephritis is inflammation of the renal pelvis and kidney. A shorter form differing by one letter names pus rather than a basin.
The substance.
MedTerm 0664 py/o: Pus
The combining form py slash o names pus. Pyuria is the presence of pus in the urine. Pyel is the renal pelvis and py is pus: one letter separates a structure from a substance, and no rule in the decoding method will catch the difference for you.
The filtering unit.
MedTerm 0665 glomerul/o: Glomerulus
The combining form glomerul slash o names a glomerulus, one of the filtering units within the kidney. Glomerulonephritis is inflammation of the glomeruli and kidney. One glomerulus, several glomeruli — the us to i plural rule from Unit One, applied.
Two entries, and the pair is the reason this topic exists separately. The names differ by one syllable and the structures differ by direction. Reading the difference off the spelling is unreliable; reading it off what each tube connects is not.
Kidney to bladder.
MedTerm 0666 ureter/o: Ureter
The combining form ureter slash o names a ureter, the tube carrying urine from a kidney to the bladder. A ureterolith is a stone in the ureter. There are two ureters, one from each kidney — the plural is ordinary and the count is worth holding.
Bladder to outside.
MedTerm 0667 urethr/o: Urethra
The combining form urethr slash o names the urethra, the tube carrying urine from the bladder out of the body. Urethritis is inflammation of the urethra. Ureters run kidney to bladder; the urethra runs bladder to outside, and the terms sound alike enough to be swapped in dictation.
Two entries, two roots, and two separate warnings. The Greek form is not confined to the urinary system at all, and the Latin form has an adjective one letter away from a word meaning something entirely different.
The Greek form.
MedTerm 0668 cyst/o: Bladder
The combining form cyst slash o names the urinary bladder, and also names any fluid-filled sac. Cystitis is inflammation of the bladder. In urinary terms it is the bladder; elsewhere it is a sac, as in cholecyst — so the system the term belongs to settles which reading applies.
The Latin form.
MedTerm 0669 vesic/o: Bladder
The combining form vesic slash o also names the urinary bladder, and comes from Latin. Vesical means pertaining to the bladder. Vesical with an a is the bladder adjective; a vesicle with an l e is a small fluid-filled lesion — same root, different word, and a spelling checker will not object to either.
Two entries. The first pair of forms names urine and the tract broadly; the second is the suffix that turns any root or prefix into a statement about what the urine contains.
The forms for urine.
MedTerm 0670 ur/o and urin/o: Urine
The combining forms ur slash o and urin slash o both name urine or the urinary tract. A urologist specialises in the urinary tract. Ur slash o names the tract broadly, including structures in both sexes — which is why urology reaches past the organs this part covers.
The condition suffix.
MedTerm 0671 -uria: Urine Condition
The suffix uria names a condition of the urine described by its root or prefix. Hematuria is the presence of blood in the urine. The suffix names what is in the urine, or how much of it there is — so the root does the specifying and the suffix supplies the frame.
Two suffixes that both describe something coming apart, and the distinction is intent. One names a process that happens; the other names a procedure somebody performs.
A process.
MedTerm 0672 -lysis: Breakdown
The suffix lysis names the breakdown, separation or destruction of whatever its root identifies. Hemolysis is the breakdown of red blood cells. Lysis names a breaking down, and a related suffix names crushing by force — the two are not interchangeable.
A procedure.
MedTerm 0673 -tripsy: Crushing
The suffix tripsy names the surgical crushing of whatever its root identifies. Lithotripsy is the crushing of a stone. Tripsy is a deliberate procedure and lysis is a process of breaking down: the difference is whether anyone intended it.
Two entries to close. The first is a term with two everyday synonyms, all three of which appear in records. The second is a term whose decoding is complete and whose clinical meaning is deliberately left to clinical training.
One act, three names.
MedTerm 0674 Micturition
Micturition is the act of passing urine from the bladder. It is also named urination or voiding in records. Three terms name one act and all three appear in clinical writing, so recognising the formal term matters more than preferring it.
Filtering, by other means.
MedTerm 0675 Dialysis
Dialysis is the filtering of waste from the blood by a means other than the kidneys. The prefix dia names through, and lysis names separation — so the term decodes cleanly from parts already taught. The term names a filtering process; what it treats belongs to clinical training.
Five things to carry out of Part One. The kidney has two combining forms, ren from Latin and nephr from Greek, and both are standard. Neither replaces the other inside a term that already uses it. The term decides which root it takes. Pyel names the renal pelvis and py names pus. They differ by one letter, and nothing in the decoding method distinguishes them — this is a pair that has to be known rather than derived. The ureter runs from a kidney to the bladder and the urethra runs from the bladder out of the body. There are two ureters and one urethra. The names sound alike, so the reliable test is what each tube connects. The suffix lysis names a breakdown that happens; the suffix tripsy names a crushing that somebody performs. Intent is the whole distinction, and it is the reason lithotripsy is a procedure and hemolysis is not. And dialysis decodes as filtering through — dia for through, lysis for separation. The term names the process and stops there. What dialysis treats, and when, belongs to clinical training rather than to terminology. Part Two turns to the reproductive systems, where the same two-languages pattern recurs and the clusters get larger.
This is free, and stays free. If it helped, here is what keeps it running.