4+5 - Water Homeostasis and the Urinary System Flashcards
Homeostasis
Maintaining a constant internal environment (within set limits)
components of homeostatic system
receptor, control center, effector,
Osmosis
Movement of water through a selectively permeable membrane (plasma membrane) from an area of lower solute concentration to an area of higher solute concentration
afferent arteriole
carries blood to the glomerulus
efferent arteriole
The small artery that carries blood away from the capillaries of the glomerulus.
renal corpuscle
glomerulus and bowman’s capsule
glomerulus
small network of capillaries encased in the upper end of a nephron; where the filtration of blood takes place
proximal convoluted tubule
first section of the renal tubule that the blood flows through; reabsorption of water, ions, and all organic nutrients
Loop of Henle
section of the nephron tubule that conserves water and minimizes the volume of urine
distal convoluted tubule
a portion of kidney nephron between the loop of Henle and the collecting duct system.
collecting duct
A segment of the nephron that returns water form the filtrate to the bloodstream.
ascending loop of henle
reabsorbs Na+ and Cl- from the filtrate into the interstitial fluid
descending limb of loop of henle
reabsorption of water continues through channels formed by aquaporin proteins
juxtamedullary nephrons
- Long nephron loops deeply invade medulla
- Ascending limbs have thick and thin segments
- Important in production of concentrated urine
ADH
antidiuretic hormone (vasopressin)
