Osmoregulation (neg. feedback) (Edexcel GCSE Biology): Flashcards
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Osmoregulation definition
Osmoregulation definition
Process controlling water & mineral ion balance in body
Purpose of osmoregulation
Purpose of osmoregulation
Maintain constant internal environment
Effect of high blood water on cells
Effect of high blood water on cells
Water moves in by osmosis, cells swell & burst
Effect of low blood water on cells
Effect of low blood water on cells
Water moves out by osmosis, cells shrink & dehydrate
Negative feedback principle
Negative feedback principle
Change triggers response that reverses initial change
Location of osmoreceptors
Location of osmoreceptors
Hypothalamus
What osmoreceptors detect
What osmoreceptors detect
Changes in blood concentration
What does ADH stand for
What does ADH stand for
Anti-Diuretic Hormone
Where is ADH released from
Where is ADH released from
Pituitary gland
ADH target organ
ADH target organ
Kidneys (collecting ducts)
ADH effect when dehydrated
ADH effect when dehydrated
Makes collecting ducts more permeable to water
Result of ADH on urine
Result of ADH on urine
More water reabsorbed, concentrated urine, smaller volume
ADH release when overhydrated
ADH release when overhydrated
Reduced/less ADH released
Result of low ADH
Result of low ADH
Less water reabsorbed, larger volume of dilute urine
Osmoregulation is an example of
Osmoregulation is an example of
Negative feedback mechanism