B3.3.4 - Inside The Kidney Flashcards
How many observable sections does the kidney have?
3
What are the 3 observable sections of the kidney called?
Capsule, Cortex and Medulla
What is the Capsule?
Outer membrane of the kidney
What is the Cortex?
Outer part of the kidney
What is the Medulla?
Inner part of the kidney
What is urine produced in?
Microscopic tubes (nephrons)
How many nephrons does the kidney approximately have?
1 million
Where is the top of a nephron found?
Cortex
Where is the bottom (loop of Henle( of a nephron found?
Medulla
What is in a nephron?
Capillaries, loop of Henle, Collecting Duct, Glomerulus, Bowman’s capsule
Describe how blood enters the kidney.
Blood enters the kidney at high pressure from the renal artery, which contains many branches leading to a glomerulus. Blood vessels narrow at the exit of the glomerulus, which increases the blood pressure and forces small molecules including water, glucose, salts and urea into the Bowman’s capsule. Large molecules ar etoo big and therefore go back into the bloodstream
What does a glomerulus contain?
A knot of capillaries
Describe selective reabsorption.
When the filtrate moves through the nephron tube, all of the glucose is reabsorbed, as well as needed salts and water. Then, the filtrate travels through the Henle loop and collecting ducts, which reabsorb any water and salt if the body needs to be regulated.
What 3 processes make up urinating?
Blood entering the kidney, selective reabsorption and excretion
How is the volume of urine produced controlled?
Negative feedback
