Homeostasis-skin

A person has been sitting in a room at 35°C for 30 minutes. What would be the effect of then drinking several glasses of iced water?

• Body temperature-falls

  Rate of sweating- falls

• Body temperature-falls

  Rate of sweating- rises

• Body temperature-rises

  Rate of sweating- falls

• Body temperature-rises

  Rate of sweating- rises

Why do mammals sweat?

• to remove glucose from the blood

• to lose water vapour through the skin surface

• to release energy through the oxidation of glucose

• to cool the body

How does sweating cool the body?

• Sweating causes vasodilation

• Sweating decreases the water content in the body

• Urea and salts are lost from the body

• Water in sweat evaporates from skin

The diagram shows some blood vessels near the surface of the skin.

If vasoconstriction ocuurs at X, What happens to the blood flow at Y and Z?

• Y-decreases

  Z-decreases

• Y- Decreases

  Z- Stays constant

• Y-Increases

  Z- Increases

• Y-Increases

  Z-Stays constant

The diagram shows a capillary loop in the skin of a mammal

What will the capillary loop look like if the mammal becomes cold?

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What would be the effects of vasodilation and sweating on the body temperature and on the amount of moisture on the surface of the skin?

• Body temperature-Decreases

  Moisture-Decreases

• Body temperature-Decreases

  Moisture-Increases

• Body temperature-Increases

  Moisture-Increases

• Body temperature-Increases

  Moisture-Decreases