Flashcards in Regulation Of Body Fluids Deck (14):
Why is water loss from the kidneys directly regulated for homeostasis of body fluids and others not?
Water loss from the lungs and alimentary canal can't be regulated. Water loss from the skin (sweat) is directly linked to temperature regulation.
Reabsorption by osmosis occurs where?
At the proximal convoluted tubule and loop of henle.
Reabsorption by active reabsorption occurs where in the nephron?
Distal convoluted tubule and and collecting tubule.
The level of active reabsorption is controlled by what hormone?
Antidiuretic hormone controls the level of active reabsorption.
Where is ADH released from?
ADH is produced by the hypothalamus and released from the posterior lobe of the pituitary gland.
When concentration of ADH is high?
The DCT and collecting duct are very permeable to water.
When the concentration of ADH in the plasma is low?
Tubules are not very permeable to water and little water is reabsorbed.
If there is an increased amount of water in the blood, osmotic pressure in tissues is lowered. The receptor of this feedback loop is?
Osmoreceptors in the hypothalamus.
What is the modulator when there is an increased amount of water in the blood?
The posterior pituitary releases less ADH.
When there is an increased amount of water in the blood, what is the effector and response?
The distal and collecting tubules have less permeability therefore less water is reabsorbed.
The feedback of a increased amount of water in the blood is... This means you will see these changes in your urine...
There will be a lowered amount of water in the blood and osmotic pressures in tissues are increased. The volume of ursine will increase and it will be diluted & lighter in colour and odour.
If you've just had a salty meal there is less water in the blood and increased osmotic pressure in tissues. What is the modulator?
The posterior pituitary releases more ADH and the nerve impulses stimulate the drinking centre of the hypothalamus.
If there is less water in the blood, what is the effector and response to maintain homeostasis?
There is increased permeability in the Distal & collecting tubules therefore increasing the reabsorption of water into the blood as water intake occurs.