Ch. 48b Flashcards
Structure of kidney
Renal cortex- outermost portion, makes 1/3 tissue mass
Renal medulla- inner 2/3 of kidney
Renal pelvis- funnel shaped
Renal artery- brings blood into kidney
Process of urine function
Filtration
Reabsorption
Secretion
Reaborption
At proximal convoluted tubule
-75% of water is reabsorbd
Urinary system
Must produce about 500 mL of urine/day to remove toxic material from body and maintain homeostasis
- produces about 1.5 to 2.5L
Collecting duct
Urine from several renal tubules flow into duct
More water is absorbed
1% of original filtrate water passes out as urine
Parts of a nephron
Bowman's capsule Glomerulus Capillaries Loop of henle Proximal convoluted tubule Distal convoluted tubule Collecting duct
Skin in excretion
Removes nitrogenous waste( a little), salt, and water
Function of kidneys regarding excretion
Remove nitrogen waste, salt, and other waste
Structure of urinary system
Kidneys -ureters -urinary bladder -urethra
Organs of excretion
Kidneys
Lungs
Skin
Secretion
At distal convoluted tubule
Other wastes and toxic materials pass out of blood
Formation of nitrogenous wastes
Produced from breakdown of proteins
Loop of henle
Maintains concentration of NaCl for osmosis of water to occur
Actively transports Cl- out and Na+ follows
Establishes concentration gradient
Nitrogenous wastes
Excreted from kidneys to help dissolve wastes
(as ammonia) goes to liver and is converted to less harmful urea
Filtration
- Water, urea, glucose, vitamins, and salt pass out of the blood in the glomerulus and into Bowman’s capsule
- proteins and cells are too large to pass through
