Urinary system Flashcards
anatomy and physiology
primarily responsible for the removal of nitrogenous wastes
Urinary system
maintain electrolyte, acid-base, and fluid balances for the bloodAnd serve as the major homeostatic organ of the body
Kidneys
perform by filtering blood allowing toxins, metabolic wastes, and excess ions to leave the body in urine
Kidneys
urinary system consists of
paired kidneys and ureters and single urinary bladder and urethra
Why is the right kidney slightly lower than the left?
Due to the liver
What are the two kinds of nephrons?
Cortical nephrons and juxtamdullary nephrons
most numerous, making up ~ 85% of nephrons located entirely within the renal cortex except for small parts of their nephron loops that dip into the renal medulla
Cortical nephrons
located deep in the cortex at the border with the medulla, their long nephron loops penetrate deeply into the medulla, *-play an important role in concentrating urine
Juxtamedullary nephrons
Urirne formation is a result of 3 processes which include
filteration, reabsorption, secretion.
the role of the glomerulus, largely a passive process in which a portion of the blood passes from the glomerular capillary into the glomerular capsule
filteration
75% to 80% of tubular reabsorption occurs in
proximal convoluted tubule
essentially the reverse process of tubular reabsorption. Hydrogen, potassium ions, and creatinine move from the blood of the peritubular capillaries through the tubular cells into the filtrate to be disposed of in the urine
secretion
vessels to and from are both arterioles
glomerulus
Feeds the bed
Afferent artiriole
Drains the bed
Efferent artiriole