Chapter 9: Urinary System Flashcards
sphincter muscles
muscles that encircle a duct to contract or expand the duct, hold the urine in place.
micturition
Excreting urine; voiding
bladder
Organ where urine collects before being excreted from the body.
Bowman’s capsule
After Sir William Bowman (1816–1892), English anatomist; Capsule surrounding a glomerulus and serving as a collection site for urine.
calices, calyces (sing., calix, calyx)
Cup-shaped structures in the renal pelvis for the collection of urine.
cortex
Outer portion of the kidney.
creatine
Substance found in urine; elevated levels may indicate muscular dystrophy.
creatinine
A component of creatine.
filtration
Process of separating solids from a liquid by passing it through a porous substance.
glomerulus (pl., glomeruli)
Group of capillaries in a nephron.
hilum
Portion of the kidney where blood vessels and nerves enter and exit.
kidney
Organ that forms urine and reabsorbs essential substances back into the bloodstream.
meatus
External opening of a canal, such as the urethra.
medulla
Soft, central portion of the kidney.
nephron
Functional unit of a kidney.
prostate
Gland surrounding the urethra in the male; active in ejaculation of semen.
reabsorption
Process of returning essential elements to the bloodstream after filtration.
renal pelvis
Collecting area for urine in the center of the kidney.
renin
Enzyme produced in the kidneys to regulate the filtration rate of blood by increasing blood pressure as necessary.
retroperitoneal
Posterior to the peritoneum.
trigone
Triangular area at the base of the bladder through which the ureters enter and the urethra exits the bladder.
urea
Waste product of nitrogen metabolism excreted in normal adult urine.
ureter
One of two tubes that conduct urine from the kidney to the bladder.
urethra
Tube through which urine is transported from the bladder to the exterior of the body.