Ch. 11 Urinary System Flashcards
The urinary system consists of:
two kidneys, two ureters, the urinary bladder, and the urethra.
The primary function of the urinary system is:
regulation of the extracellular fluids of the body (primarily plasma and tissue fluid).
The kidneys main purpose:
remove waste products from plasma as they form urine.
Urines path:
Urine, containing waste products, passes from the kidneys via the ureters to the urinary bladder for temporary storage before it is excreted from the body through the urethra.
electrolyte
Mineral salt of the body
carries electrical charge
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 (define, contents)
Product of protein metabolism that includes urea, uric acid, creatine, creatinine, and ammonia
peristaltic wave
Sequence of rhythmic 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 alkalinity or acidity of a solution
plasma
Liquid portion of blood that is filtered by the nephrons to remove dissolved wastes
The macroscopic structures that make up the urinary system include:
two kidneys, two ureters, a bladder, and a urethra
What is the overall function of the macroscopic structures that make up the urinary system?
regulate composition of extracellular (blood/tissue) fluids by removing harmful products (nitrogenous wastes/excess electrolytes)
retains beneficial products required by the body.
Nitrogenous products are:
toxic, and the kidneys must continuously eliminate them, or death will occur within a few days
Proper balance of electrolytes are:
crucial to operation of the brain, nerves, and muscles and essential for tissue repair
Which urinary structure regulates the composition of extracellular fluids?
Kidneys
What hormone do the kidneys excrete and what is it’s function?
erythropoietin
acts on bone marrow to stimulate production of red blood cells when blood oxygen levels are low.
Review Figure 11-1
pg 360
Location of kidneys:
retroperitoneal (outside of peritoneum)
in the abdominal cavity slightly above the waistline
renal cortex:
the outer area of the kidney
renal medulla:
middle area of the kidney
nephrons (short definition)
microscopic filtering units
hilum or hilus
near the medial border
opening where renal artery enters and renal vein exits kidney
Urine originated from:
the kidneys removing waste products from blood in the renal arteries.
ureter
moves urine in PERISTALTIC WAVES from renal pelvis to bladder (ureteral orifice)
slender tube ~10-12” inches long
renal pelvis
hollow cavity
merges kidney with ureter
peristaltic waves (function)
keep urine flowing toward the bladder, rather than regurgitating back into the kidney during urination when bladder pressure increases
urinary bladder
expandable hollow organ
temporary reservoir for urine
contains rugae that expand as bladder fills
trigone
leads to urethra
located at the base of kidneys
triangular area formed by two openings of the ureters and the urethra
urethra
a tube that discharges urine from the bladder.
1.5˝ in women
7˝ to 8˝ in men (passes through prostate gland and penis)
urination (define and AKA)
aka micturition
expels urine through an opening in the urethra, the urinary meatus.
Complete Anatomy Review
pg 362
Urinary Structures
Approximately, how many nephrons are in a kidney?
1 million
nephron (function)
remove nitrogenous wastes, excess electrolytes (other products that exceed body limit)
maintain homeostasis by continually adjusting/regulating composition, volume, and pH of blood plasma and tissue fluid
2 nephron structures:
renal corpuscle and a renal tubule
renal corpuscle is composed of:
glomerulus (tuft of capillaries )
Bowman (glomerular) capsule (modified, enlarged extension of the renal tubule that surrounds the glomerulus)
afferent arteriole
carries blood to the glomerulus
larger than efferent arteriole
efferent arteriole
carries blood from the glomerulus
smaller than afferent arteriole
What is significant about the size difference in the afferent and efferent arterioles?
provides the needed pressure to force fluids and soluble material from blood plasma into the Bowman capsule
filtrate resembles:
plasma but with less protein
efferent arteriole passes behind the:
renal corpuscle to form peritubular capillaries
peritubular capillaries
network of capillaries that surround the renal tubule
4 sections if renal tubule:
proximal convoluted tubule
loop of Henle
distal tubule
collecting tubule
collecting tubule:
transports newly formed urine to renal pelvis for excretion by kidneys
nephron performs three physiological functions as it produces urine:
filtration
absorption
secretion
Filtration
When contents of plasma (water, electrolytes, sugar, and other small molecules) pass from afferent tubule into Bowman capsule to form filtrate.
Reabsorption
as filtrate travels through renal tubule, water/electrolytes/amino acids
reenter circulating blood through peritubular capillaries
Secretion
final stage of urine formation
peritubular capillaries secrete waste products, such as (ammonia, uric acid, metabolic products of medications)
into renal tubules for removal in urine.
Urines exit nephron from ________ and enters the ______
collecting tubule
renal pelvis
View Figure 11-2
Nephron pg 360
Complete Anatomy Review
Nephron pg 362
The main function of the urinary system is to
regulate extracellular fluids of the body
functional relationships between the urinary system and
Blood, Lymphatic, and Immune
- filters plasma, regulating blood plasma and lymph.
* reabsorbs needed products/ removes unwanted from plasma
functional relationships between the urinary system and
Cardiovascular
• regulates electrolytes needed for contraction of heart.
functional relationships between the urinary system and
Digestive
- removes excessive glucose from blood
* removes excessive fluids absorbed from GI tract
functional relationships between the urinary system and
Endocrine
- The urinary system regulates electrolyte and fluid balance, which is essential for hormone transport in the blood.
- The urinary system produces erythropoietin, a hormone synthesized mainly in the kidneys to stimulate bone marrow production of blood cells.
functional relationships between the urinary system and
Female Reproductive
• The urinary system aids in removing waste products produced by the fetus in the pregnant woman.
functional relationships between the urinary system and
Integumentary
- The urinary system compensates for extracellular fluid loss resulting from hyperhidrosis by regulating fluid loss during urine production.
- The urinary system adjusts electrolytes, especially potassium and sodium, in response to their loss through sweating.
functional relationships between the urinary system and
Male Reproductive
• The urinary system shares the urethra with the male reproductive system for delivery of semen to the female.
functional relationships between the urinary system and
Musculoskeletal
• The urinary system works in conjunction with bone tissue to maintain a constant calcium level.
functional relationships between the urinary system and
Nervous
• The urinary system regulates sodium, potassium, and calcium, which are the electrolytes responsible for the transmission of nervous stimuli.
functional relationships between the urinary system and
Respiratory
• The urinary system assists the lungs in regulating the acid–base balance of the body.
albumin/o
albumin, protein
albumin/oid
resembling albumin
azot/o
nitrogenous compounds
bacteri/o
bacteria (singular, bacterium)
cyst/o
bladder
vesic/o
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
kidney
ren/o
kidney
noct/o
night
kidney
nephr/o
ren/o
olig/o
scanty