proximal convoluted tubule Flashcards
(18 cards)
What happens in this part of the kidney?
Reabsorption
What process happens here initially?
Facilitated diffusion
What happens after this?
Active transport
What does this absorption of water occur by?
Osmosis
What lowers the water potential of the blood?
Glucose, amino acids and ions
What indicates the presence of diabetes in someone’s urine?
Glucose
What are the adaptations of the cell lining in the PCT?
Microvilli, numerous mitochondria, carrier proteins
What are the microvilli adapted for?
Larger surface area
What are the numerous mitochondria for?
Providing ATP for active transport
What are the carrier proteins for?
Active transport
What is the role of the loop of Henle?
Removes water from the filtrate
How does it do this?
Actively transporting sodium and chloride ions out of the ascending limb
What does this create?
A high concentration of ions in the medulla
What does this mean for the medulla tissues?
Low water potential
What happens to water?
It moves out the filtrate by osmosis
What happens to the filtrate?
It becomes increasingly concentrated
Which limb is permeable to water?
Descending limb
Which limb is impermeable to water?
Ascending limb
