FINALS: URINARY SYSTEM Flashcards
pH above 7.45
ALKALOSIS
pH below 7.35
ACIDOSIS
arterial pH between 7.35 & 7.0
PHYSIOLOGICAL ACIDOSIS
Systems of 1 or 2 molecules that act to
prevent dramatic changes in H+
concentrations when acids/bases are added
Bind to H+ when pH drops
Release H+ when pH rises
1st line of defense in resisting pH changes
BLOOD BUFFERS
3 MAJOR CHEMICAL BUFFER SYSTEMS:
Bicarbonate buffer system
Phosphate buffer system
Protein buffer system
- Mixture of carbonic acid (H2CO3) & sodium
bicarbonate (NaHCO3) - Bicarbonate ions (HCO3‾) react with strong acids to
change them to weak acids - Carbonic acid dissociates in the presence of a strong
base to form a weak base and water
BICARBONATE BUFFER SYSTEM
prevents excessive water loss in urine
ADH
regulates Na+ content
of ECF
ALDOSTERONE
ALDOSTERONE IS TRIGGERED BY THE?
renin-angiotensin
mechanism
Regulate aspects of homeostasis: water
balance, electrolytes, acid-base balance in
blood, BP (renin) , RBC production (EPO),
activation of vitamin D
Excretes wastes in urine
Lie against the DORSAL body wall in a retroperitoneal position in the superior
lumbar region
Right kidney is slightly lower than the left
Attached to ureters, renal blood vessels, &
nerves at renal hilum
Atop each is an adrenal gland
Adult: 12 cm (5in)long, 6 cm (2.5in) wide, & 3 cm (1in) thick
KIDNEYS
Transport urine from kidneys to urinary
bladder
URETERS
Stores urine & expels it into urethra
URINARY BLADDER
Discharges urine from body
URETHRA
KIDNEY COVERINGS:
- Smooth, transparent sheet of dense
irregular connective tissue that is
continuous with the outer coat of the
ureter
Barrier against trauma & helps MAINTAIN THE SHAPE OF KIDNEY
FIBROUS CAPSULE
KIDNEY COVERINGS:
- Mass of fatty tissue surrounding the
fibrous capsule
Protects the kidney from trauma &
holds it firmly in place within the
abdominal cavity
PERIRENAL FAT CAPSULE
KIDNEY COVERINGS:
- Thin layer of dense irregular connective
tissue
ANCHORS the kidney to the surrounding structures & to the abdominal wall
RENAL FASCIA
RENAL MEDULLA:
Triangular regions with a striped appearance
Renal/medullary pyramids
RENAL MEDULLA:
portions of the renal
cortex that extend between renal
pyramids
Renal columns
RENAL PELVIS: inner collecting tube
- cup-shaped structures that funnel urine towards the renal pelvis
Calyces
The structural and functional units of the
kidneys
Responsible for forming urine
NEPHRONS
TYPES OF NEPHRONS:
Located entirely in the cortex
Includes most nephrons
CORTICAL NEPHRONS
TYPES OF NEPHRONS:
Found at the boundary of the cortex & medulla
JUXTAMEDULLARY NEPHRONS
CAPILLARY BEDS ASSOCIATED WITH
NEPHRONS:
Feeder vessel: afferent arteriole
Receives blood that has passed through
glomerulus: efferent arteriole
GLOMERULUS
CAPILLARY BEDS ASSOCIATED WITH
NEPHRONS:
Arise from efferent arteriole of the glomerulus
Normal, low-pressure capillaries
Attached to a venule
Cling close to the renal tubule
Reabsorb (reclaim) some substances from
collecting tubes
PERITUBULAR CAPILLARIES