Unit 3: Urinary Flashcards
Which direction is secretion, and reabsoprtion?
Secretion is blood to lumen
Reabsorption is lumen to blood
what does ADH do for the urinary system
inc water reabsoprtion from DCT and collecting ducts - inc # of water pores in cell
If ADH to low = inadequate water reabsorb
= high vol of dilure urine ( low SG) and in drinking to comp for water loss (PU/PD) -> diabetes insipidus
What does aldosterone do for the urinary system?
inc Na reabsorb from DCT and collecting ducts, creates osmotic imbalance, draws water back into blood but req ADH to occur
Water intake regulated by thirst center in hypothalamus - responds to BP and water conc in blood
What part of the nephron does filtration occur
What part of th enephron does reabsorb of AA’s and glucose occur?
What part of the nephron does Na reabsorb occur?
What is the primary loc of water reabsorb
What is the name of urea and creatinine accumulating in the blood>
Azotemia/uremia.
Can be before, within, or afterD
Describe prerenal azotemia - b4 kidney
dec blood flow to kidneys due to dehydration, CHF, shock
may still have adequate function
What is renal azotemia
problem within kidneys
damages nephrons due to toxins, infections, or inflam
poorly func or destroyed nephrons can’t filter blood - causes toxins to accumulate
What amount of kidney loss is needed before seeing clinical signs?
2/3 to 3/4 of nephron function must be lost
Describe postrenal azotemia
problem after kidneys
usually due to urethral obstruction due to stones, mucus plugs, blood clots or tumors
if severe, can cause urine to back up into kidneys and damage or destroy nephrons (to cause renal azotemia
