1. It is important that humans maintain a constant internal environment (homeostasis)

2. Humans respond to changes in external temperature in different ways

HomeostasisHomeostasisHomeostasisHomeostasis

Homeostasis

HomeostasisHomeostasisHomeostasisHomeostasis

Homeostasis

HomeostasisHomeostasisHomeostasisHomeostasis

Homeostasis

Functions of the skinFunctions of the skinFunctions of the skinFunctions of the skin

Functions of the skin

Structure of the skinStructure of the skinStructure of the skinStructure of the skin

Functions of the skin

Hot or cold?Hot or cold?Hot or cold?Hot or cold?

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

KidneysKidneysKidneysKidneys

Kidneys

KidneysKidneysKidneysKidneys

Kidneys

KidneysKidneysKidneysKidneys

Kidneys

The NephronThe NephronThe NephronThe Nephron

The Nephron

The NephronThe NephronThe NephronThe Nephron

The Nephron

KidneysKidneysKidneysKidneys

Kidneys

ADH – too little water in bloodADH – too little water in bloodADH – too little water in bloodADH – too little water in blood

ADH

ADH – too much water in bloodADH – too much water in bloodADH – too much water in bloodADH – too much water in blood

ADH

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