Chapter 18 Flashcards
What are functions of the urinary system
Regulation of plasma ion concentration Regulation of plasma volume and blood pressure Regulation of plasma osmolarity Regulation of plasma ion concentration Regulation of metabolic waste products
How does blood travel through the renal system
Renal artery Afferent arteriole Glomerulus Efferent arteriole Peritubular capillaries Renal vein
Define excretion
Elimination of materials through the urine
Define filtration
Fluid from the plasma leaves the capillaries and enters the Bowman’s capsule
Define reabsorption
Fluid from the interstitial space enters the capillaries
Define secretion
Transport of molecules from the peritubular capillaries into the renal tubules
What is hydrostatic pressure
The pressure exerted by a fluid against the membrane
What is osmotic pressure
The pull of fluid across a membrane by a solute
What does GFR stand for
Glomerular filtration rate
What are 2 functions of GFR
Homeostasis
Blood pressure regulation
What is the goal of intrinsic control of GFR
Maintain GFR
What is the goal of extrinsic control of GFR
Maintain blood pressure
What is the body’s main mechanism to control blood pressure
Renin-angiotensin-aldosterone system
What does renin do?
Converts angiotensinogen into angiotensin
What are some effects of angiotensin II
Vasoconstriction
Increase aldosterone secretion
Increase ADH secretion
