11.3 Kidney (HL) Flashcards
What is the excretory system in insects?
Malpighian tubules
How do Malpighian tubules work?
Directly branches of the intestinal tract and uptakes nitrogenous waste which is combined later with digested food and excreted via the anus
Describe the structure of the kidney
Oxygenated blood brought by the renal artery and deoxygenated removed via the renal vein
The ureter leads into the renal pelvis which branches into medulla surrounded by a cortex
What molecule in the kidney filter blood?
Nephrons
What do nephrons produce?
Urine
How will blood in the renal vein differ from that in the renal artery?
Less urea
Less water and solutes
Less glucose and O2
More CO2
Describe the components of a nephron
Bowman’s capsule
Proximal convoluted tubule
Loop of Henle
Distal convoluted tubule
What is the function of the Bowman’s capsule (kidney)?
First part of the nephron where blood is initially filtered to form filtrate
What is the function of the proximal convoluted tubule (kidney)?
Folded structure connected to the Bowman’s capsule where selective reabsorption occurs
What is the function of the loop of Henle (kidney)?
Selectively permeable loop that descends into the medulla and establishes a salt gradient
What is the function of the Distal convoluted tubule (kidney)?
Folded structure connected to the loop of Henle where further selective reabsorption occurs
What are the functions of nephrons?
Ultrafiltration
Selective reabsorption
Osmoregularion
Where in the nephron does ultrafiltration occur?
The glomerulus at the Bowman’s capsule
Where in the nephron does selective reabsorption happen?
In the convuluted tubules (proximal and distal)
Where in the nephron does osmoregulation happen?
In the loop of Henle a salt gradient draws water out of the collective duct
Describe the glomerulus
A knot-like capillary tuft encapsulated by the Bowman’s capsule and comprised of surface cells called podocytes
Between the podocytes and glomerulus is a basement membrane which filters blood