lecture 19 - tubular reabsorption and secretion

the return of water and solutes to the bloodstrea

what is tubular reabsorption

99

what percent of filtered water is reaborbed

transfer of material from blood into the tubular fluid

what is tubular secertion

• control blood pH

• help eliminate waste, toxins, ane excess subtances from the body

what are the benefits of tubular secretion

H

secretion of what ion will increase your pH

between

does paracellular reabsorption go through or between tubule cells

tight junctions dont completly seal off

how is reabsorption between cells in the nephron possiple

through

what transcellular reabsorption go through or between a cell

primary active transport

• sodium potassium pump with ATP

secondary active transport

• symporters

• antiporters

leakage and facilitated diffusion channels

obligatory vs facultative water reabsorption

what are the different ways reabsorption can occur

water absorbed with solutes that is obligated to follow the solutes when the are reabsorbed

this is ALWAYS happening

what is obligatory water reabsorption

happens when dehydrated

it is regulated by ADH and occurs in the last distal and the collecting duct

what is facultative water reabsorption

what triggers it

• water

• na

• k

• glucose

• amino acids

• cl

• urea

what is reabsorbed into blood

• h

• nh

• urea

• creatinine

what is secreted into urine