Question 1
Feedback mechanisms are used in living organisms both to promote and respond to change.
Outline the role of ADH in osmoregulation.
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Feedback mechanisms are used in living organisms both to promote and respond to change.
Outline the role of ADH in osmoregulation.
ADH (secreted by pituitary) if body/blood is dehydrated/hypertonic/has high solute concentration;
more aquaporins / aquaporins open (in collecting duct);
collecting duct more permeable to water/reabsorbs more water (from filtrate/urine);
water reabsorbed by osmosis/water reabsorbed because medulla is hypertonic;
(reabsorbed) water passes (from filtrate) to blood / blood solute concentration reduced;
less water lost in urine / smaller volume of (more concentrated) urine;
negative feedback / less/no ADH secreted when blood solute concentration returns to normal;