Urinary System Notes Flashcards
What are the components of the Urinary system?
Kidneys and the urine conductive organs (Ureter bladder and urethrae)
Functions of the Urinary system?
Recycle water, Control of BP, and excretion (Ridding of metabolic wastes)
The 3 types of nitrogenous waste
Amonia
Urea
uric acid
most toxic to least
Paired dorsal fins in verts
Filled with cellular tubules that form and convey urine
2 types of tubules in the kidney
Nephrons- make urine
Collecting Ducts- make urine into uriter
What are the 3 things done by the nephron?
Glomerular filtration
Tubular reabsorption
Tubular Secretion
Glomerular filtration
blood pressure drives
plasma from glomerulus to renal tubule via holes in
glomerular capillaries. Filtrate includes wastes plus
valuable small molecules. Cells and proteins remain in
glomerulus.
Tubular reabsorption
valuable small molecules
are actively transported from filtrate back into
blood of peritubular capillaries. e.g. water, sugars,
amino acids
Tubular Secretion
active transport of factors from peritubular capillaries into the renal tubule. e.g. H+
Kidney Power
Ability of kidney to reabsorb and recycle water.
Most powerful kidneys in desert and marine
mammals.
Kidney Power is most powerful in….
Marine verts and Desert mammals as they can shed excess salts.
What are the important excretory structures in marine Verts?
shed excess salts
Gills in salt water boney fish
rectal gland in sharks
cranial glands in marine reptiles and birds
Nephron cells do what
Control day to day BP via Renin-Angiotensin system
Renin-Angiotensin system
Nephron cells detect an increase in BP and release Renin into the blood
Renin
converts Angiotensinogen
(circulating protein) to Angiotensin I (hormone
precursor)
Angiotensin I converted to Angiotensin II by
Angiotensin Converting Enzyme (ACE)
