Please enable JavaScript.
Coggle requires JavaScript to display documents.
Urinary System (Structure of a Nephron (renal corpuscle (bowman capsule…
Urinary System
Structure of a Nephron
-
renal corpuscle
-
-
-
bowman capsule surrounds the glomerulus, is an indented double-walled chamber
- has a visceral and parietal layer
- visceral layer is constructed of podocytes
- parietal layer is constructed of simple squamous epithelium
filtration membrane
- consists of capillary endothelium, vasement membrane and podocytes of hte bowman capsule
- performs first step of urine production
- once blood is filtered, it eneters teh lumen inside the bowman capsule
-
loop of henle
- located in both the cortex and the medulla
- helps conserve water and solutes
distal convoluted tubule
- rids blood of additional wastes
-
- fluid travels to collecting duct, carries new formed urine from cortex to the renal papilla. several collecting ducts merge into a larger tubule called a papillary duct
types
juxta-medullary
- renal corpuscles found near medulla
- have long loops of henle that extend deep into medulla
cortical
- renal corpuscles are distributed throughout cortex
- loops of henle are shorter and are closer to the outer edge of the cortex
-
Functions
excretion
- 21% of blood pumped out of the heart each minute is routed to the kidneys
- large molecules, such as proteins remain in the blood
- smaller molecules and ions enter the filtered fluid
- as fluid flows through kidneys, it's slowly modified until it's converted to urine
- reabsorption of most fluid volume is needed to convert blood to urine
- resulting fluid contains metabolic wastes, toxic molecules and excess ions
- additional waste products are secreted into fluid, forming urine
-
-
-
-
activation of vitamin D
- play an important role in controlling blood levels of Ca2+ by activating vitamin D
-
-