Urinary system Flashcards
What are the 6 functions of the urinary system
- Filtration of blood 2. Production and excretion of urine 3. Regulation of fluid and electrolyte balance 4. Excretion of wastes 5. Regulation of blood composition 6. Regulation of blood pH
What are the 4 main components of the urinary system
- Kidneys 2. Ureters 3. Urinary Bladder 4. Urethra
Kidneys filter ______ and produce _____
blood and produce urine
Ureters transport
urine to the bladder
Urinary bladder stores
urine
Urethra transports
Urine out of the body
The kidney lie in the _______ position
retroperitoneal position
The kidneys are externally covered by a
Fibrous capsule and layers of fat
Miscroscopic functional filtration units of the kidneys
Nephrons
What are the 2 major regions of a nephron
- Renal corpuscle 2. Renal tubule
The renal corpuscle is where
filtration occurs
What 2 structures are in the renal corpuscle
- Glonerulus 2. Bowman’s/ glomerular capsule
The renal tubule consists of what 3 structures
- Proxymal convoluted tubule 2. nephron loop 3. Distal convoluted tubule
Specialized capillaries in the renal corpuscle that filter blood
glomerulus
surrounds the glomerulus and captures filtrate
Bowman’s/glomerular capsule
primary site of reabsorption
proxymal convoluted tubule
what 2 parts of the renal tubule are sites of reabsortion and secretion
- nephron loop 2. Distal convoluted tubule
What are the 2 types of nephrons
- Cortical nephrons 2. Juxtamedullary nephrons
Which type of nephron is shorter
Cortical nephrons
What type of nephron makes up 85% of nephrons
Cortical nephrons
Which type of nephron helps regulate urine concentration
Juxtamedullary nephron
What percentage of cardiac output goes directly to the kidneys
20-25%
Urine formation involves what 3 processes
- Glomerular filtration 2. Tubular reabsorption 3. Tubular secretion
Where does glomerular filtration occur
the glomerular capillaries
What substances should be included in filtrate
water and dissolved solutes
What substances should not be included in filtrate
Formed elements and large plasma proteins
Glomerular capillaries are _____ to allow substances to pass through
fenestrated (porus)
Filtration of urine is driven by
hydrostatic pressure
Kidneys are capable of producing _______ L of filtrate per day
180
Amount of filtrate produced/ minute
glomerular filtration rate
What is the normal GFR range
90-120 mL/min
Lower than average GFR can indicate
kidney disease or kidney failure