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urinary system (internal division (cortical structure (renal corpuscle),…
urinary system
internal division
-
medullary structure
- pyramid: collection of tubules
minor/major calices
- minor calices surrounding the apex of the renal pyramid
- collection of minor calices formed major calices
renal pelvis
- the point where the major calices join together
- the funnel-like dilated part of the ureter in the kidny
urinary tract
ureter
- slender tubes, about 25 cm long
- carry urine from the kidneys to the bladder
-
urethra
- a thin-walled tube that drains urine from
the bladder and conveys it out of the body
main function
regulation of
- concentration of ions in blood, K+, Na+, Ca2+, Cl
- concentration of hydrogen iron--ph
- volume of blood
excretion of
- water
- nitrogen wasted
- foreign substance
- drugs
- toxins
-
classes of nephrons
cortical nephrons
- 85% of all nephrons
- located almost entirely within the cortex
juxtamedullary
- 15% of remaining nephrons
- very long nephron loop
filtration
- blood fluid leavs capillaries in glomerulus and enter tubules
resorption
- much of water have been filtered is taking back to capillaries (new tubules)
excretion
- movement of waste from the capillaries near tubules into kidney tubules