Intro to water and ADH

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Slide 1

Animal survival

Water and waste

Slide 2

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.

Slide 3

70 % of our bodies are water!

Slide 4

We gain liquid from….

Milk

Tea

Coffee

7up

Water itself!

Food?!

Chemical reactions…

Slide 5

Chemical reactions

Aerobic respiration

Glucose + oxygen  Water + Carbon + energy dioxide

Slide 6

We lose water through…

Sweat

Breath

Urine (kidneys)

Faeces (easily expelled)

Slide 7

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!

Slide 8

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.

Slide 9

Water content

of the blood normal

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

Urine output

LOW

Brain produces

Less ADH

Urine output

HIGH

High volume of water

reabsorbed by kidney

Low volume of water

reabsorbed by kidney

(small volume of

Concentrated urine)

(large volume of

dilute urine)