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Animal survival PowerPoint PPT Presentation


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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

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Animal survival l.jpg

Animal survival

Water and waste


Aims of today l.jpg

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.


70 of our bodies are water l.jpg

70 % of our bodies are water!


We gain liquid from l.jpg

We gain liquid from….

  • Milk

  • Tea

  • Coffee

  • 7up

  • Water itself!

  • Food?!

  • Chemical reactions…


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Chemical reactions

Aerobic respiration

Glucose + oxygen  Water + Carbon + energy dioxide


We lose water through l.jpg

We lose water through…

  • Sweat

  • Breath

  • Urine (kidneys)

  • Faeces (easily expelled)


Water balance l.jpg

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!


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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.


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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)


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