proximal convoluted tube Flashcards
as the fluid from bowmans capsule passes along nephron where does it lead to
proximal convoluted tubule
how are cells which line the convoluted tubule specialised for selective reabsorption
plasma membrane is folded to form microvilli.
increases surface area for reabsorption
contains cotransport proteins which transport glucose/ amino acids along with sodium into the cell
what pump is present on the plasma membrane of pct cells
sodium potassium pump which pumps sodium out and potassium into the cell
what organelle would be abundant in pct cells
mitochondria as there is lots of active processes, therefore lots of atp can be produced by respiration
What is the first step of selective reabsorption
sodium ions are actively pumped out of the cells lining to pct
what is the effect of sodium ions being pumped out of pct cells
a concentration gradient of sodium occurs in the cytoplasm
Due to the sodium-potassium pump, sodium has been pumped out of the pct cells, creating a conc grad. what now?
sodium ions diffuse into cell through cotransport protein carrying glucose or amino acids at the same time
What molecules have to be accompanied by cotransport protein
glucose or amino acids
what is the end product of selective reabsorption
Glucose or amino acids diffuse into the blood along with the osmosis of water into the cell.
what process requires atp in selective reaborption
sodium potassium pump
how many sodium ions are pumped out versus how many K+ are pumped in
3 sodium are pumped out
2 potassium pumped in
what topic can also be linked to this
membrane structure and cell specialisation
