NEPHRONS Flashcards
approximately how many nephrons ?
1 million
what do nephrons produce ?
urine
to rid of excess water and solutes(urea, waste products) eliminated in form of urine ?
excretion
movement of urea/nutrients (water, urea, glucose, amino acids,creatinine, urea) out of blood this takes place between glomerulus and bowmans capsule
filtration
99% is _____ along length of tubule: reabsorbed, filtrated, secreted, excreted
reabsorbed
glomerular filtrate is components of blood which has been filtered in the glomerulus what is composed of these components ?
water, glucose, amino acids, salts (ions), Na+, Cl-,K+, HCO3-, waste products
what is the process of reabsorption ?
substances are reabsorbed that the body requires, mainly water and salts
list 2 main places reabsorption occurs
proximal convulted tubule and loop of hence
whats main purpose is to maintain the balance of water an salt
Kidney
what does aldosterone help ?
water reabsorption
what does ADH help ?
more water to be absorbed
what does both aldosterone and ADH help ?
help body retain water and help with water and salt balance
additional wastes or toxic substances (uric acid, organic acids) that may still be in bloodstream must be added to glomerulus filtrate occurs in proximal tubule and distal (actively)
secretion
ascending or descending limb of hence impermeable to water ?
ascending limb of henle
what to label on nephron (in order of what comes first on diagram)
efferent arteriole, afferent arteriole (exit), glomerulus, bowmans capsule, proximal convoluted tubule, loop of henle (descending limb of hence,ascending limb of hence), distal convoluted tubule, collecting tubule
order of processes in nephron
- filtration (glomerulus filtrate is production of this)
- proximial- reabsorption and secretion
- descending- reabsorption
- ascending- reabsorption
- distal- reabsorption and secretion
- collecting duct - reabsorption and excretion
hormone that regulates urine production
antidiuretic
process by which water is returned to the blood supply
reabsorption
to maintain a constant concentration of essential metabolites (such as glucose) in blood and consequently in body tissues
reabsorption
where does ADH act ?
collecting duct
where does aldosterone act ?
loop of hence
