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Osmoregulation - Coggle Diagram
Osmoregulation
-
Blood too
Concentrated
-
-
- osmoreceptors in hypothalamus detect
SP of blood more negative
- posterior lobe of pituitary body
releases more ADH into blood
- walls of DCT + CD
more permeable
-
- more water reabsorbed
from UF in CD to Bl
- SP blood returns
to normal
- SMALLER volume of MORE
CONCENTRATED (hypertonic) urine
Blood too Dilute
-
-
- osmoreceptors in hypothalamus
detect SP of blood too high
- posterior lobe of pituitary body
releases less ADH
- walls of DCT + CD become
less permeable
-
- less water reabsorbed from
UF in CD back into blood
- SP blood returns
to normal
- LARGER volume or LESS
CONCENTRATED urine produced
Loop of Henle
structure
walls made of cuboidal epithelium cells
- rich in mitochondria
- provide ATP
DESCENDING LIMB
-
- water removed by osmosis
along desc limb
due to
- very neg SP in medulla
from (sodium chloride)
- permeable walls of DL
water then removed from medulla
to enter vasa recta
- so has little effect on SP of interstitial
fluid in medulla
- SP of filtrate in DL becomes increasingly
MORE NEGATIVE as move along
-
-
- @ very bottom of DL (apex) -
filtrate is hypertonic
ASCENDING LIMB
walls
- thick
- impermeable to water
- secretes Na+ and Cl-
ions into medulla
-
- filtrate inside AL becomes increasingly MORE DILUTE as move along
-
-
- sodium chloride builds up in interstitial
fluid in medulla - very negative SP
-
-
desert mammals
- longer loop of Henle
- more water reabsorbed
- and conserved in organism
- longer loop allows
- medulla to have even more negative SP
- more water osmotically removed from DL
- producing small vol, conc urine
-
-
Where does it
take place?
-
-
although most water
selectively reabsorbed in PCT
- this process passive
- amount cannot be controlled
in DCT + CD - facultative reabsorption
(is optional/can be controlled) of water
- dependant on level of ADH in blood
Negative Feedback
-
-
-
as SP of blood returns to normal
(increases/decreases)
- release of ADH changes (inc/dec)
- returns to normal
- to prevent over-correction