Chapter 11 Flashcards
urinary system
the primary function is regulation of extracellular fluids of the body (primarily plasma and tissue fluid) and their excretion from the body; it consists of:
1) two kidneys
2) two ureters
3) the urinary bladder
4) the urethra
electrolyte
mineral salt of the body that carries an electrical charge and regulates nerve impulses, muscle contraction, hydration, and blood pH
filtrate
fluid that passes from the blood through the capillary walls of the glomeruli into Bowman capsule
nitrogenous waste
product of protein metabolism that includes urea, uric acid, creatine, creatinine, and ammonia
peristaltic wave
sequence of rythmic contraction of smooth muscles of a hollow organ to force material forward and prevent backflow
peritoneum
serous membrane that lines the abdominopelvic cavity and covers most of the organs within the cavity
pH
symbol that expresses the degree of alkalinity or aciditiy of a solution
plasma
liquid portion of blood that is filtered by the nephrons to remove dissolved wastes
kidneys (function and location)
work to continuously eliminate nitrogenous products, balance electrolytes, and secrete erythropoietin; they are located slightly above the waistline and are retroperitoneal (outside of the peritoneum)
kidneys (structure)
the outer area of the kidneys is the renal cortex and the middle area is the renal medulla which contain nephrons (microscopic filters); the hilum is located at the medial border through which the renal artery and vein run
renal pelvis
urine enters the renal pelvis after leaving the kidney where it meets up with the ureter
ureter
a slender tube approximately 10” to 12” long that utilizes peristaltic waves to carry urine to the bladder
urinary bladder
acts as a temporary resevoir for urine which enters through the ureteral orifice
trigone
a triangular area at the base of the bladder that is formed by the two openings of the ureters and leads to the urethra
urethra
a tube that discharges urine from the bladder and expels it through the urinary meatus
micturition
urination
nephrons (function)
microscopic structures that maintain homeostasis by continually adjusting and regulating the composition, volume, and pH of blood plasma and tissue fluid
nephrons (structure)
composed of a renal corpuscle and a renal tube
renal corpuscle
composed of a tuft of capillaries called glomerulus and a modified, enlarged extension of the renal tube known as the Bowman (glomerular) capsule
nephron vessels
1) afferent arteriole - carries blood to the glomerulus
2) efferent arteriole - carries blood away from the glomerulus; passes bethind the renal corpuscle to form the pertubular capillaries that surround the renal tubule
renal tubule
composed of four sections:
1) proximal convoluted tubule
2) loop of Henle
3) distal tubule
4) collection tubule - transports newly formed urine to the renal pelvis for excretion by the kidneys
filtration (in the nephrons)
occurs in the renal corpuscle as water, electrolytes, sugar, and other small molecules in blood plasma in the afferent tubule pass into the Bowman capsule to form filtrate
reabsorption (in the nephrons)
begins as filtrate travels through the long, twisted pathway of the tubule; most of the water and some of the electrolytes and amino acids from the tubule reenter the circulating blood through the peritubular capillaries
secretion (in the nephrons)
the final stage of urine formation; the peritubular capillaries actively secrete waste products, such as ammonia, uric acid, and metabolic products of medications, into the renal tubules for removal in urine; urine leaves the collection tubule and enters the renal pelvis from which it passes to the bladder for temporary storage until urination takes place
albumin/o
albumin, protein
azot/o
nitrogenous compounds
bacteri/o
bacteria (singular, bacterium)
cyst/o (1 of 2)
bladder
vesic/o (1 of 2)
bladder
glomerul/o
glomerulus
kal/i
potassium (an electrolyte)
keton/o
ketone bodies (acids and acetones)
lith/o
stone, calculus
meat/o
opening, meatus
nephr/o (1 of 2)
kidney
ren/o (1 of 2)
kidney
noct/o
night
olig/o
scanty
py/o
pus
pyel/o
renal pelvis
ur/o
urine, urinary tract
ureter/o
ureter
urethr/o
urethra
-genesis
forming; producing; origin
-iasis
abnormal condition (produced by something specified)
-uria
urine
dia-
through, across