Repro And Urinary Flashcards
Kidneys needed to maintain
Water. Balance/Homeostasis. if kidneys fail=uremia poisoning
Kidney function
Maintain water balance
Excrete toxins
Excrete waste containing nitrogen
Regulate many chemicals in body
Secretes erythropoietin (*from bone marrow to increase RBC which will increase O2 for transport to O2 starved tissues)
Location or ureters
Upper end inside kidneys
Lower end connects to bladder
Long narrow tubes
Drain urine from kidneys to bladder
Urethra extends from bladder to exterior by way of
Urinary meatus
Urethra is a narrow tube lined with
Mucous membranes
Name urethra sphincters ;
Internal- involuntary
External- voluntary
Micturarion is
Voiding
Storage of urine permitted by
Bladder wall.p. Accumulation with little pressure
Stretching initiates urination
Urinary retention
Urine produced but not voided
Urinary incontinence
Urine is voided involuntarily more common in older adults
Can be caused by spinal injury or stroke
May cause cystitis
Urinalysis
Examine physical and chemical properties under microscope
Chang in or abnormal characteristics may indicate desease
Internal structure of kidney-
Microscopic structure of kidney-
Nephrons-more than 1 million in each kidney
2 main portions- renal tubule = proximal tubule, formerly Henley loop now nephron loop, distal loop, collecting duct
Renal capsule=glomerular capsule,glomerulus
Microscopic structure of kidney-Renal tubule
Proximal tubule(convoluted)
Nephron loop formerlyHenle loop
Distal tubule (convoluted)
Collecting duct
**Glomerular capsule AKA Bowman capsule
Cup shaped (top of nephron) surrounds glomererulus
**Secretion of urine
Continuous
Hydrogen, potassium,ions, drugs and ammonia are secreted
They move from blood into petitubular capillaries and into urinnein distal and collecting tubules
Control of urine volume
Anti diuretic hormone ADH (decreases urine) is secreted from posterior pituitary gland (*if no ADH no water is reassured from tubules)
Aldesterone (hormone secreted by by adrenal cortex) stimulates tubules to reabaorb sodium at a faster rate which reduces amount of urine
Atril natriuretic hormone ANH increases urine ANH secreted from atria of heart
Filtration of urine
Happens in renal corpuscles
Filters water and blood in glomerulus into urine of glomerular capsule
Normal glomerular filtration rate GFR is 125ml per min
Reabsorption of urine
Water nutrients and ions move from urine in renal tubules into blood in peritubular capillaries