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Animal survival. Water and waste. Aims of today…. To be able to: Identify ways in which a mammal gains and loses water. State that the kidneys are the main organs for regulating the water content in a mammal. Explain the role of ADH in the regulation of water balance.

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animal survival

Animal survival

Water and waste

aims of today
Aims of today…

To be able to:

  • Identify ways in which a mammal gains and loses water.
  • State that the kidneys are the main organs for regulating the water content in a mammal.
  • Explain the role of ADH in the regulation of water balance.
we gain liquid from
We gain liquid from….
  • Milk
  • Tea
  • Coffee
  • 7up
  • Water itself!
  • Food?!
  • Chemical reactions…
chemical reactions
Chemical reactions

Aerobic respiration

Glucose + oxygen  Water + Carbon + energy dioxide

we lose water through
We lose water through…
  • Sweat
  • Breath
  • Urine (kidneys)
  • Faeces (easily expelled)
water balance
Water balance
  • 70% of our bodies are water.
  • Stays constant due to our kidneys…
  • Drinking lots of water =

lots of pee!

  • Drinking little water =

Little pee!

slide8
ADH
  • Kidneys are controlled by anti-diuretic hormone (ADH) released from the pituitary gland (attached to brain).
  • ADH (a hormone) controls volume of water reabsorbed and returned to bloodstream by kidneys.
  • Water not reabsorbed passes to bladder as urine to be expelled.
slide9

Water content of the blood HIGH

Water content of

the blood LOW

Too much water drunk

Too much salt

or sweating

Brain produces

More ADH

Brain produces

Less ADH

Water content

of the blood normal

Low volume of water

reabsorbed by kidney

High volume of water

reabsorbed by kidney

Urine output

HIGH

Urine output

LOW

(small volume of

Concentrated urine)

(large volume of

dilute urine)

slide10

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