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Urinary System Mrs. Atchison HS I
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4.01 Remember the structures of the urinary system Essential Question
What are the structures of the urinary system? 4.01 Remember the structures of the urinary system
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Urinary System Functions of Urinary System:
Excretion- removing nitrogenous wastes, certain salts and excess water from blood. Maintain acid-base balance Secrete waste products in the form of urine – remove waste from body Eliminate urine from bladder
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What if kidneys are not working properly?
Toxic wastes would accumulate in the cells, poisoning them
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Structures of the urinary system
Kidneys Ureters Bladder Urethra Urinary meatus 4.01 Remember the structures of the urinary system
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Structures of the urinary system
Kidneys Bean-shaped organs Located between peritoneum and the back muscles (RETROPERITONEAL) Renal Pelvis- funnel shaped structure at the beginning of the ureter 4.01 Remember the structures of the urinary system
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Medulla Inner, striated layer
Striated cones (divisions) are renal pyramids
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Cortex Composed of millions of microscopic functional units called nephrons
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Nephrons Functional unit of the kidney
Over 1 million in each kidney which comprise 140 miles of filters and tubes Parts include: Bowman’s capsule Glomerulus Proximal convoluted tubule Loop of Henle Distal convoluted tubule Collecting tubule
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Question The Bowman’s capsule, proximal convoluted tubule, and loop of Henle are all parts of a: A. bladder. B. nephron. C. pelvis. D. ureter.
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Answer NEPHRON
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Question The functional unit of the kidney is the: A. aldosterone.
B. bladder. C. nephron. D. renin.
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Answer NEPHRON
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Structures of the urinary system
Kidneys External structures Renal capsule Renal hilum Internal structures Renal cortex Renal medulla Renal pelvis 4.01 Remember the structures of the urinary system
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Structures of the urinary system
External kidney Renal fascia Fibrous layer of connective tissue Renal hilum Indentation that gives the kidney its bean-shaped appearance 4.01 Remember the structures of the urinary system
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Structures of the urinary system
Renal cortex Composed of millions of microscopic functional units called nephrons 4.01 Remember the structures of the urinary system
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Structures of the urinary system
Renal cortex Composed of millions of microscopic functional units called nephrons 4.01 Remember the structures of the urinary system
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Structures of the urinary system
Ureters Muscular tube extending from each kidney to the urinary bladder Lined by a mucous membrane 10-12” long Ureters 4.01 Remember the structures of the urinary system
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Question If kidney stones get too large, they can cause severe flank pain and hydronephrosis because they block the: A. bladder. B. nephron. C. ureter. D. urethra.
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Answer Ureter
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Understand the functions of the urinary system
Fluid and electrolyte balance What effect does this cycle have on your blood pressure? 4.02 Understand the functions and disorders of the urinary system
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4.02 Understand the functions and disorders of the urinary system
Understand the functions of the urinary system The flow of electrolytes Review urine formation, electrolyte exchange, and some factors that effect urine volume. 4.02 Understand the functions and disorders of the urinary system
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Understand the functions of the urinary system
review Understand the functions of the urinary system If more water is reabsorbed back into the body---what will happen to urine concentration? (more or less concentrated?) 4.02 Understand the functions and disorders of the urinary system
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4.02 Understand the functions and disorders of the urinary system
Urinalysis 4.02 Understand the functions and disorders of the urinary system
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Ureters One from each kidney Carry urine from kidney to bladder
Smooth muscle tube with mucous membrane lining Peristalsis pushes urine down ureters The tubes that connect the kidneys and bladder.
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Question Urine leaves the kidney by way of the: A. glomerulus.
B. nephron. C. ureter. D. urethra.
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Answer URETER
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Structures of the urinary system
Urinary bladder Hollow muscular organ Located in pelvic cavity Made of elastic fibers and involuntary muscles 4.01 Remember the structures of the urinary system
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Question Which structure is a hollow muscular sac? A. Bladder
B. Kidney C. Ureter D. Urethra
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Answer Bladder
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Structures of the urinary system
Female Urethra Connects the bladder to the outside of the body Female 1-2” long Male 4-6” long Urinary meatus Opening to the outside of the body Male 4.01 Remember the structures of the urinary system
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4.02 Understand the functions and disorders of the urinary system
Essential Questions What are the functions of the urinary system? What are some disorders of the urinary system? How are disorders of the urinary system treated? How do you relate the body’s hormone control to the urinary system? 4.02 Understand the functions and disorders of the urinary system
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Understand the functions of the urinary system
Excretion Formation of urine Fluid and electrolyte balance Elimination of urine 4.02 Understand the functions and disorders of the urinary system
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Understand the functions of the urinary system
Filtration Reabsorption Secretion 4.02 Understand the functions and disorders of the urinary system
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4.02 Understand the functions and disorders of the urinary system
Filtration First step in urine formation Blood from renal artery enters glomerulus High blood pressure in glomerulus forces fluid (Filtrate) to filter into Bowman’s capsule (function of glomerulus is to filter substances from the blood) 4.02 Understand the functions and disorders of the urinary system
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Filtration-Con’t Filtrate does not contain plasma proteins or RBCs- they are too big Bowman’s capsule filters out 125cc of fluid/min. – 7500cc/hour As filtrate continues through nephron, 90% of water is reabsorbed
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Question Jessica is experiencing hematuria. Which process of urine formation has been ineffective? A. Filtration B. Reabsorption C. Secretion D. Excretion
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Answer Filtration
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Question The patient in chronic renal failure is treated with hemodialysis. What renal function does hemodialysis replace? A. Filtration B. Hormone control C. Nervous control D. Peristalsis
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Answer Filtration
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4.02 Understand the functions and disorders of the urinary system
Reabsorption Water and useful substances are reabsorbed If blood levels of certain substances are high (glucose, amino acids, vitamins, sodium) then those substances will not be reabsorbed Useful substances filter out of the renal tubules and back into the capillaries around the tubules = reabsorption 4.02 Understand the functions and disorders of the urinary system
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Question Mr. Gavin has had polyuria for several weeks. When he went to the doctor, his urinalysis was normal. Further studies revealed that Mr. Gavin had a disorder that affected the release of ADH. Which function of the urinary system was affected? A. Elimination B. Filtration C. Reabsorption D. Secretion
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Answer Reabsorption
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Question Dehydration has a direct effect on urine formation. The proximal convoluted tubules are responsible for correcting the water imbalance found with dehydration. What is this process called? A. Diffusion B. Filtration C. Reabsorption D. Secretion
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Answer reabsorption
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4.02 Understand the functions and disorders of the urinary system
Secretion Opposite of reabsorption Secretion transports substances from blood into collecting tubules Substances include creatinine, hydrogen ions, potassium ions, and some drugs Electrolytes are selectively secreted to maintain body’s acid-base balance 4.02 Understand the functions and disorders of the urinary system
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Question Excessive substances in urinary filtrate, such as sodium and potassium, lead to their elimination. Which process of elimination is this urinary system function? A. Diffusion B. Filtration C. Reabsorption D. Secretion
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Answer Secretion
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Urinary Output Average= 1500 ml/day
Urinalysis- examination of urine to determine presence of blood cells, bacteria, acidity level, specific gravity and physical characteristics (color, clarity and odor) Normal in urinalysis = Ammonia not normal = glucose, blood, pus
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What color is your pee?
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Question Jeremy is on the cross country team at school. He notices that after practice his urine is dark amber-colored and he is voiding very small amounts. Jeremy has: A. cystitis. B. dehydration. C. enuresis. D. polyuria.
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Answer dehydration
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Path of urine formation
Afferent arteriole - Glomerulus – Bowman’s capsule – proximal convoluted tubule – loop of Henle – distal convoluted tubule – collecting tubule – renal pelvis - ureter
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Chemical Control Reabsorption of H2O in distal convoluted tubule controlled by ADH (antidiuretic hormone) Secretion and regulation of ADH controlled by hypothalamus Diuretics inhibit reabsorption of H2O Production of urine is controlled by ADH and aldosterone
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Disorders of the urinary system
4.02 Understand the functions and disorders of the urinary system
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Disorders of the urinary system
Cystitis What is cystitis (cyst= medical term for ____ +itis =___ ) Most common cause: E. Coli What are the major symptoms of cystitis? 4.02 Understand the functions and disorders of the urinary system
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Question The student presented at her doctor’s office with complaints of dysuria, urinary frequency and lower abdominal discomfort. Upon examination, the doctor discovered that the student’s hygiene was inadequate. Which organism MOST LIKELY caused the student’s symptoms? A. Clostridium difficile B. E-coli C. Staphylococcus D. Streptococcus
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Answer E-coli
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Disorders of the urinary system
Cystitis More common in females—Why ?? Rx= antibiotics 4.02 Understand the functions and disorders of the urinary system
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Disorders of the urinary system
Glomerulonephritis Two types: Acute Chronic 4.02 Understand the functions and disorders of the urinary system
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Disorders of the urinary system
Renal calculi Also known as nephrolithiasis nephro lith iasis What are renal calculi made of? What are the symptoms? 4.02 Understand the functions and disorders of the urinary system
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Disorders of the urinary system
Renal calculi What will happen if the ureters are blocked? 4.02 Understand the functions and disorders of the urinary system
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Disorders of the urinary system
Renal calculi How is it treated? 4.02 Understand the functions and disorders of the urinary system
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Disorders of the Urinary System
Renal Calculi (Kidney Stones) Made of crystals of calcium phosphate and uric acid Gradually they get larger until they block ureters First symptom- severe pain Other symptoms- nausea and vomiting, frequency, chills, fever, hematuria Diagnosis- by symptoms, ultrasound, or x-ray Rx- increase fluids to flush out stone, medications, and if needed- lithotripsy
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Disorders of the Urinary System
Renal Calculi (Kidney Stones) Made of crystals of calcium phosphate and uric acid Gradually they get larger until they block ureters First symptom- severe pain Other symptoms- nausea and vomiting, frequency, chills, fever, hematuria Diagnosis- by symptoms, ultrasound, or x-ray Rx- increase fluids to flush out stone, medications, and if needed- lithotripsy
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Kidney Transplant As a last resort for renal failure
Involves donor organ from someone with a similar immune system Main complication- rejection
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Disorders of the urinary system
Renal Failure Chronic kidney disease leads to a buildup of fluid and waste products in the body. 4.02 Understand the functions and disorders of the urinary system
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Disorders of the urinary system
Renal Failure How is it treated? Peritoneal dialysis What is the process involved in this treatment? 4.02 Understand the functions and disorders of the urinary system
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Dialysis (Hemodialysis)
Used for kidney failure Involves the passage of blood through device with semipermeable membrane Dialysis serves as substitute kidney Blood from patient flows through machine and is filtered Can be done at home or in clinic Takes 2-4 hours, 2-3 times a week
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Question The patient sustained an electric shock when he accidentally touched live wires while cleaning up the yard following a severe storm. The shock affected his urinary function and resulted in oliguria and uremia. How will the patient’s symptoms be treated if he develops anuria? A. Antibiotics B. Catheterization C. Hemodialysis D. Lithotripsy
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Answer hemodialysis
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Disorders of the urinary system
Renal transplant What is the major complication of renal transplantation? 4.02 Understand the functions and disorders of the urinary system
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Question Dialysis involves the use of a device that rids the blood of harmful wastes by passing the blood through: A. a biological sponge. B. a semipermeable membrane. C. an electrolyte gel. D. chemical neutralizers in a filter system.
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Answer Semi-permeable membrane
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Terminology Enuresis- bedwetting Gylcosuria- sugar in urine
Nocturia- frequent urination at night Polyuria- large amounts of urine Anuria- no urine produced Hematuria- blood in urine Diuretic- drug or substance to increase urine production Oliguria – decreased urine production (sign of kidney failure)
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Question The medical term for excessive urination is: A. incontinence.
B. nocturia. C. oliguria. D. polyuria.
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Answer polyuria
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Question Mr. Burns had a stroke and has been urinating involuntarily. What is this condition called? A. Cystitis B. Glomerulonephritis C. Incontinence D. Pyuria
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Answer incontinence
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Question Jack takes his blood pressure medicine every morning. After taking his medicine, he experiences urinary frequency. What type of blood pressure medicine is Jack taking? A. ADH B. Antibiotic C. Diuretic D. Renin
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Answer Renin
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