1.It is important that humans maintain a constant internal environment (homeostasis) 2.Humans respond to changes in external temperature in different ways.

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Presentation transcript:

1.It is important that humans maintain a constant internal environment (homeostasis) 2.Humans respond to changes in external temperature in different ways Homeostasis Homeostasis

Homeostasis

Homeostasis

Functions of the skin

Structure of the skin Functions of the skin

Hot or cold?

1.Water, and small molecules such as urea, salt and sugar, are filtered from the blood by the kidneys 2.Selective reabsorption of sugar, salt and some water occurs 3.Dialysis can be used in cases of kidney failure 4.Organs can be replaced by surgical transplants 5.Transplants may be rejected by the immune system Kidneys Kidneys

Kidneys

Kidneys

The Nephron

Kidneys Kidneys

ADH – too little water in blood ADH

ADH – too much water in blood ADH

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Quiz Quiz

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