Urinary System Overview and Functions

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Questions and Answers

What is the name of the fissure on the medial surface of the kidney where structures enter and exit?

  • Hilum Renale (correct)
  • Sinus Renalis
  • Calices Minores
  • Renal Pelvis

What is the primary function of the urinary system?

  • Regulation of blood pressure
  • Digestion of food
  • Removal of waste products from the blood (correct)
  • Production of hormones

Which of the following is NOT a part of the urinary system?

  • Urinary Bladder
  • Kidneys
  • Pancreas (correct)
  • Ureters

Where are the kidneys located?

<p>In the abdominal cavity (B)</p> Signup and view all the answers

What is the correct order of structures from calyx minor to ureter?

<p>Calyx minor, Calyx major, Pelvis renalis, Ureter (B)</p> Signup and view all the answers

What is the functional unit of the kidney?

<p>Nephron (C)</p> Signup and view all the answers

What does the medulla renalis contain?

<p>Pyramidal structures (A)</p> Signup and view all the answers

What is the rate of filtration in the glomerulus?

<p>120 mL/min (C)</p> Signup and view all the answers

What is the primary function of reabsorption in the nephron?

<p>To return beneficial substances to the bloodstream (C)</p> Signup and view all the answers

Which part of the bladder is located between the apex and the fundus?

<p>Corpus vesicae (A)</p> Signup and view all the answers

How are metabolic waste products transferred into the urine?

<p>By excretion from capillaries into the nephron tubules (C)</p> Signup and view all the answers

What is the average capacity of a fully distended bladder?

<p>500 mL (A)</p> Signup and view all the answers

Which anatomical feature is described as the narrowest part of the bladder?

<p>Cervix vesicae (D)</p> Signup and view all the answers

Which statement is true regarding male and female urethra lengths?

<p>The female urethra is significantly shorter than the male urethra (B)</p> Signup and view all the answers

What is the main function of the ureters?

<p>To transport urine to the bladder (B)</p> Signup and view all the answers

Where does the ureter enter the pelvis?

<p>Through the linea terminalis (C)</p> Signup and view all the answers

Flashcards

Filtration

The process of filtering blood plasma from the glomerulus into Bowman's capsule, occurring at a rate of 120 mL/min.

Kidneys

The organs responsible for filtering blood, removing waste products, and regulating body fluids.

Nephron

The functional unit of the kidney, responsible for filtering blood and producing urine.

Hilum Renale

A fissure on the medial surface of the kidney where structures enter and exit.

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Pelvis Renalis

A chamber in the kidney that collects urine from the nephrons and directs it to the ureter.

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Cortex renalis

The outer region of the kidney containing the glomeruli and Bowman's capsules.

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Medulla renalis

The inner region of the kidney, containing the renal pyramids.

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Calyces Minores

Small, cup-shaped structures that collect urine from the renal pyramids.

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Excretion in the kidney

The process by which metabolic waste products are transferred from capillaries into the tubules of the nephron, becoming part of urine.

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Reabsorption in the kidney

Active and passive transport of beneficial substances like water, glucose, and certain electrolytes back into the bloodstream from the nephron tubules.

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Renal artery

A branch of the abdominal aorta that supplies blood to the kidney.

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Ureter

A channel that carries urine from the kidney to the bladder.

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Bladder

The main reservoir for urine storage in the body.

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Trigone of the bladder

The triangular region at the base of the bladder, where the ureters and urethra connect.

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Urethra

The tube that carries urine from the bladder to the outside of the body.

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External urethral sphincter (males)

The muscular sphincter at the opening of the urethra in males. It helps control the flow of urine.

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Study Notes

Urinary System

  • The urinary system transports waste from kidneys to bladder
  • In females, the ovaries are near the kidneys
  • Kidneys filter blood, take up considerable space in main vessels

Kidney Functions

  • Blood filtration
  • Waste products removal
  • Electrolyte balance maintenance
  • Acid-base balance maintenance
  • Blood volume and pressure regulation
  • Vitamin D activation
  • Erythropoietin production
  • Creatinine excretion

Kidney Location

  • Located in upper posterior abdominal wall
  • On either side of the vertebral column
  • Right kidney at the level of T12 to L3
  • Left kidney at the level of T11 to L2
  • Left kidney is positioned higher than right

Urinary System Organs

  • Two kidneys
  • Two ureters
  • Urinary bladder
  • Urethra

Urinary System Function

  • Removes metabolic wastes and excess water
  • Maintains blood electrolyte and acid-base balance
  • Regulates blood pressure and volume

Bladder

  • Reservoir for urine
  • Located posterior to symphysis pubis (in females, anterior to uterus, males anterior to rectum)
  • Normal capacity is roughly 220 mL, expanding to up to 500 mL

Ureters

  • Channels transporting urine from kidneys to bladder
  • Approximately 25-30 cm long
  • Pass through the linea terminalis to enter pelvic minor
  • Travel along the lateral wall of the pelvis to reach the bladder

Urethra

  • Transports urine out of the body
  • Males: 20 cm long
  • Females: 3-5 cm long
  • Contains internal and external sphincters

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