excretory systemm

Question 1

excretory system function

Answer 1

maintaining homeostasis
1. filtration of body fluids
2. regulation of blood pH
3. maintaining osmotic balance

Question 2

broadly how does the excretory system maintain homeostasis

Answer 2

metabolic waste removal
reabsorption of specific nutrient molecules
secretion and reabsoprtion of H+
osmotic movement of water
maintains salt and water balances and rids body of nitrogen containing wastes

Question 3

metabolic waste removal
animals excrete nitrogenous wastes in different forms. why and what are these forms

Answer 3

some animals convert toxic ammonia to less toxic compounds prior to excretion

fish and most aquatic animals excrete ammonia (they pee a lot and don’t have to worry about osmotic balance because they live in water)

mammals use ATP to convert NH3 to less toxic urea; we can store urea so we have to urinate leess
we concentrate urea so we lpse less water

birds and other animals convert urea to uric acid which is less toxic but expends more atp
it is highly concentrated

Question 4

what key functions does the excretory system have that allows for filtration of body fluids

what stages exist in exretory system 4 steps

Answer 4

excretory systems produce urine by refining a filtrate derived from body fluids

filtration : filtering waste of body fluids via size

reabsorption: reclaiming valuable solutes from filtrate into blood

secretion: adding nonessential solutes and wastes from blood to filtrate

excretion: processed filtrate containing nitrogenous wastes is released from body

Question 5

kidney structure

Answer 5

renal artery brings blood to kidney to be filtered and also delivers nutrients and sustenance to kidney

renal vein leaves kideny and should have blood that is rid of waste

renal cortex and renal medulla help us orient our nephron
renal medulla is further into the kidney and renal coortex is more outer

2 types of nephron : cortical and juxtamedullary
juxtamedullary goes further and into renal medulla

renal pelvis: where filtrate pools after filtration of blood

leads filtrate to ureter

Question 6

nephrons

Answer 6

functional unit of kidney

made up of renal corpuscle, in cortex, renal tubules in medulla and collecting duct that starts at cortex, pass through medulla, and empty into the ureter

Question 7

glomerulus

Answer 7

where size blood filtration occurs via capillaries