urinary system a&p. urinary system aka excretory system removes wastes & excess water...
TRANSCRIPT
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URINARY SYSTEM
A&P
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URINARY SYSTEM
•AKA EXCRETORY SYSTEM
•REMOVES WASTES & EXCESS WATER
•MAINTAIN ACID-BASE BALANCE
•HELPS MAINTAIN BODY’S HOMEOSTASIS
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URINARY SYSTEM
PARTS OF THE URINARY SYSTEM:
2 KIDNEYS
2 URETERS
1 BLADDER
1 URETHRA
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KIDNEYS
•BEAN-SHAPED ORGANS
•FOUND ON EITHER SIDE OF VERTEBRAL COLUMN
•LOCATED IN RETROPERITONEAL SPACE
•RETROPERITONEAL SPACE=AREA BEHIND UPPER PART OF ABD CAVITY; SEPARATED FROM ABD CAVITY BY PERITONEAL MEMBRANE
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KIDNEYS
•PROTECTED BY RIBS & FAT CUSHION
•HELD IN PLACE BY CONNECTIVE TISSUE
•EACH KIDNEY IS ENCLOSED IN MASS OF FATTY TISSUE=ADIPOSE CAPSULE
•EACH KIDNEY IS COVERED BY A TOUGH, FIBROUS TISSUE=RENAL FASCIA OR FIBROUS CAPSULE
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KIDNEYS
DIVIDED INTO 2 MAIN SECTIONS: CORTEX & MEDULLA
CORTEX=
oOUTER SECTION
oCONTAINS MOST OF THE NEPHRONS (NEPHRONS AID IN PRODUCTION OF URINE)
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KIDNEYS
MEDULLA=
oINNER SECTION
oCONTAINS MOST OF THE COLLECTING TUBULES (COLLECTING TUBULES CARRY URINE FROM NEPHRONS THROUGH THE KIDNEY)
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KIDNEYS
•EACH KIDNEY HAS A HILUM
•HILUM=NOTCHED OR INDENTED AREA
•THE URETER, NERVES, BLOOD VESSELS, & LYMPH VESSELS ENTER & LEAVE THE KIDNEY THROUGH THE HILUM
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KIDNEYS
•NEPHRONS=MICROSCOPIC FILTERING UNITS OF THE KIDNEY
•THERE ARE MORE THAN 1 MILLION NEPHRONS PER KIDNEY
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KIDNEYS
EACH NEPHRON CONSISTS OF A:
GLOMERULUS
BOWMAN’S CAPSULE
PROXIMAL CONVOLUTED TUBULE
DISTAL CONVOLUTED TUBULE
COLLECTING DUCT (TUBULE)
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KIDNEYS
•THE RENAL ARTERY CARRIES BLOOD TO THE KIDNEY
•BRANCHES OF THE RENAL ARTERY PASS THROUGH THE MEDULLA TO THE CORTEX
•THIS IS WHERE BLOOD ENTERS THE 1ST PART OF THE NEPHRON, THE GLOMERULUS
•GLOMERULUS=CLUSTER OF CAPILLARIES
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KIDNEYS
•WATER, MINERAL SALTS, GLUCOSE, METABOLIC PRODUCTS, & OTHER SUBSTANCES ARE FILTERED OUT OF THE BLOOD AS IT PASSES THROUGH THE GLOMERULUS
•RBCS & PROTEINS ARE NOT FILTERED OUT
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KIDNEYS
•FILTERED BLOOD LEAVES THE GLOMERULUS & MOVES TO THE RENAL VEIN WHICH CARRIES IT AWAY FROM THE KIDNEY
•THE SUBSTANCES FILTERED OUT BY THE GLOMERULUS ENTER THE NEXT SECTION OF THE NEPHRON, BOWMAN’S CAPSULE
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KIDNEYS
•BOWMAN’S CAPSULE=C-SHAPED STRUCTURE THAT SURROUNDS THE GLOMERULUS
• IT IS THE START OF THE CONVOLUTED TUBULE
•BOWMAN’S CAPSULE PICKS UP THE FILTERED MATERIALS & PASSES THEM INTO THE CONVOLUTED TUBULE
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KIDNEYS
•AS THE FILTERED MATERIAL PASSES THROUGH THE TUBULE, SUBSTANCES NEEDED BY THE BODY ARE REABSORBED AND RETURNED TO THE BLOOD CAPILLARIES
•THOSE SUBSTANCES ARE MOST OF THE WATER, GLUCOSE, VITAMINS, AND MINERAL SALTS
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KIDNEYS
•EXCESS GLUCOSE AND MINERAL SALTS, SOME WATER, AND WASTES (UREA, URIC ACID, AND CREATININE) REMAIN IN THE TUBULE
•THESE EXCESS SUBSTANCES ARE A CONCENTRATED LIQUID=URINE
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KIDNEYS
•URINE ENTERS COLLECTING DUCTS (TUBULES) LOCATED IN THE MEDULLA
•THE COLLECTING DUCTS EMPTY INTO THE RENAL PELVIS (RENAL BASIN),
•RENAL PELVIS=FUNNEL-SHAPED STRUCTURE THAT IS THE 1ST SECTION OF THE URETER
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URETERS
•2 MUSCULAR TUBES
•10-12 INCHES LONG
•RENAL PELVIS=FUNNEL-SHAPED 1ST SECTION OF URETER
•ONE URETER EXTENDS FROM THE RENAL PELVIS OF EACH KIDNEY TO THE BLADDER
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URETERS
•PERISTALSIS MOVES URINE THROUGH URETER FROM KIDNEY TO BLADDER
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BLADDER
•HOLLOW, MUSCULAR SAC
•FOUND BEHIND SYMPHYSIS PUBIS
•LOCATED AT MIDLINE OF PELVIC CAVITY
•RECEIVES URINE FROM URETERS
•STORES URINE UNTIL IT IS VOIDED
•VOID=URINATE=MICTURATE
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BLADDER
•LINED WITH MUCOUS MEMBRANE
•MUCOUS MEMBRANE HAS RUGAE (FOLDS)
•RUGAE DISAPPEAR AS BLADDER EXPANDS TO FILL WITH URINE
•BLADDER WALLS ARE MADE OF TRIPLE LAYER OF VISCERAL (SMOOTH) MUSCLE
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BLADDER
•CIRCULAR SPHINCTER MUSCLE CONTROLS THE BLADDER OPENING TO PREVENT EMPTYING
•RECEPTORS IN BLADDER SEND OUT A REFLEX ACTION WHICH OPENS THE MUSCLE
•URGE TO VOID OCCURS WHEN BLADDER HAS 250ML BUT IT CAN HOLD MUCH MORE
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BLADDER
• INFANTS CANNOT CONTROL THE REFLEX ACTION
•AS CHILDREN GROW, THEY LEARN TO CONTROL THE REFLEX
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URETHRA
•TUBE THAT CARRIES URINE FROM BLADDER TO OUTSIDE OF BODY
•URINARY MEATUS=EXTERNAL OPENING OF URETHRA
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URETHRA
FEMALE URETHRA:
1.5 INCHES LONG
OPENS IN FRONT OF VAGINA
CARRIES ONLY URINE
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URETHRA
MALE URETHRA:
8 INCHES LONG
PASSES THROUGH THE PROSTATE GLAND
EXISTS THE PENIS
CARRIES BOTH URINE & SEMEN (NOT AT THE SAME TIME)
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URINE
•LIQUID WASTE PRODUCT OF URINARY SYSTEM
•APROX 95% WATER
•CONTAINS DISSOLVED WASTE PRODUCTS:
UREA, URIC ACID, CREATININE, MINERAL SALTS, PIGMENTS
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URINE
•EXCESS USEFUL PRODUCTS (LIKE SUGAR) CAN ALSO BE FOUND IN URINE
•WHEN USEFUL PRODUCTS ARE IN URINE, IT USUALLY INDICATES DISEASE
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URINE
•KIDNEYS FILTER ABOUT 150 QUARTS OF LIQUID DAILY
•ABOUT 1,500-2,000 ML (1.5-2 QUARTS) OF URINE ARE PRODUCED DAILY
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URINATION TERMS
TERMS USED TO DESCRIBE CONDITIONS THAT AFFECT URINATION:
POLYURIA=EXCESSIVE URINATION
OLIGURIA=BELOW NORMAL AMOUNT OF URINE
ANURIA=ABSENCE OF URINATION
HEMATURA=BLOOD IN URINE
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URINATION TERMS
PYURIA=PUS IN URINE
NOCTURIA=URINATION AT NIGHT
DYSURIA=PAINFUL URINATION
RETENTION=INABILITY TO EMPTY BLADDER
INCONTINENCE=INVOLUNTARY URINATION
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URINATION TERMS
PROTEINURA=PROTEIN IN URINE
ALBUMINURA=ALBUMIN (A BLOOD PROTEIN) IN URINE