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A&P Ch. 25

Urinary System

Organ that performs most of the urinary functions? Kidneys
Approx. how many liters of blood do the kidneys filter per day? 200 L
What do the kidneys produce that controls blood pressure? Renin
Stimulates erythrocyte production EPO
Superficial portion of the kidneys Renal cortex
Deep portion of the kidneys Renal medulla
Name the order of renal blood flow from the point the blood enters the kidney Renal artery, interlobar arteries, arcuate arteries, nephrons, interlobar veins, renal vein
Functional unit of urine formation Nephrons
Most common type of nephron Cortical nephrons
Regulates water balance by concentrating or diluting urine Juxtamedullary nephrons
Blood to filtrate filtration (first time) Glomerular filtration
Filtrate to blood filtration Tubular reabsorption
Blood to filtrate filtration (second time) Tubular secretion
Recieves filtrate from glomerulus Glomerular capsule
Capillary bed for filtration of blood Glomerulus
Solution high in solute Hypertonic solution
Solution low in solute Hypotonic solution
Wherever _____ is transported __________ follows NA+, Water
Why does water follow sodium? When the sodium is transported it makes the blood hypertonic, increasing the osmotic pressure, and causing the water to transport via osmosis toward it.
Increases water reabsorption in the distal convoluted tubule and collecting duct ADH (Anti-Diuretic Hormone)
Substances are not reabsobed if they: Lack carrier proteins, are not lipid soluble, or are too large to pass through membrane pores
most important nonreabsobed substances Urea, creatinine, uric acid
Tubular secretion is important for: Disposing of substances not already in the filtrate (such as medications), Ridding the body of excess K+, and controlling blood pH
Dilute urine is formed when: Water intake is high, and/or solute intake is low
Concentrated urine is formed when: Water intake is low, and/or solute intake is high, and/or there is other water loos occuring in the body
Chemicals that enhance urinary output? Diuretics
Typical urine is _____ water, and _____ wastes 95% water, and 5% wastes
Created by: Joshdole04



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