Excretion Flashcards
(43 cards)
What is ADH
Anti- diuretic hormone
Deanination
Conversion of excess amino acids into urea
What is an Endocrine glad
A gland that does not have a duct ( tube) coming out of it
What is a exocrine gland
A gland that has a tube (duct) coming out of it
Egestion
Removal of undigested food material
Excretion
Removal of the waste products of metabolism
Filtration
Removal of materials from the blood
Glomerular filtrate
Content of the blood that has passed through the glomerulus
Homeostasis
The maintenance of a constant internal environment in a living organism
Osmoregulation
Maintaining a constant water level in a living organism
Reabsorption
Returning of filtered material to the blood
Name the source, site of excretion, how it’s made and the excretory product of the organs of excretion.
Protein-Kidneys-filtration and reabsorbtion-urea
Carbs/lipids/proteins-lungs-breathing-Co2 + water Vapor
——-skin-sweating-salts
Excess amino acids- liver-deamination - Bile
Name a method of excretion is plants
Gasses diffuse out of stomata/ lenticels
Why is homeostasis so important in a living organism
So enzymes in the living organism can work at optimism conditions
Functions of the kidney
Execretion
Osmoregulation: maintaining a constant water balance within an organism
Controls PH of body fluids
Where are the kidneys located
Abdominal cavity
Name the associated blood supply of the kidney
Renal artery (comes from aorta/ linked to afferent arteriole) carries O2 and food to the kidney
Renal vein( goes to the vena Cana /linked to efferent arteriole carries CO2 and waste products away from kidney
What is the purpose of the nefron
Increase surface area for filtration and reabsorption
How does the nephron aid the filtration and reabsorption process/ what are its adaptive features
Having a large surface area for greater filtration and reabsorption
Walls of nefron are one cell thick for faster and easier absorption
Surrounded by a good blood supply for aiding in reabsorption and secretion
What is the cortex responsible for
Filtration
What is the medulla responsible for
Reabsorption
Describe associated blood supply of the nefron before urine formation
Blood enters the kidney via the afferent arteriole ( coming from renal artery) The afferent arteriole is larger than the efferent arteriole so that it creates pressure and forces the blood out the arteriole in high pressure to enter the gllmerulus
Describe the process of filtration
Some of the contents ( amino acids, glucose, water , salts and urea)is passed through the glomerulus and become known as the glomrulus filtrate. The filtrate is collected by the Bowman’s capsule and passed to the proximal convoluted tube
Describe the process of reabsorption
The glomerulus filtrate is mostly absorbed by the proximal convoluted tubule . expect Urea
Glucose, AA, vitamins are reabsorbed by active transport and diffusion ( aided by folding scales micro-villi)
Water also reabsorbed by osmosis
Some water(descending loop) and salts(ascending loop) are reabsorbed along the loop of henle