control of body temp

• What is the normal body temperature in Celsius?

  37°C
• What is the process called that regulates body temperature?

  Thermoregulation
• What happens to arterioles supplying blood to capillaries when the body is too hot?

  They dilate to increase blood flow.
• What is the effect of vasodilation on heat loss?

  It increases heat loss through radiation.
• Where is the thermoregulatory center located?

  In the hypothalamus.
• What is produced when the body temperature rises?

  Sweat is produced.
• What happens to arterioles when the body is too cold?

  They constrict to reduce blood flow.
• What is the result of vasoconstriction in terms of heat energy?

  Less heat energy is lost.
• What is the effect of constricted arterioles on blood flow to the skin?

  It reduces blood flow to the surface of the skin.
• What happens to blood flow when arterioles constrict?

  There is less blood flow in.
• What is the primary function of the thermoregulatory center?

  To detect changes in temperature.
• vasodilation


  arterioles supplying blood to capillaries near surface of skin dilate (widen) leading to more blood flow to vessels and more heat loss through radiation
• vasoconstriction


  arterioles supplying the skin capillaries constrict -narrowing blood flow to the surface

  less blood flow to surface of skin

  less heat energy lost
• sweating


  Sweat glands secrete more sweat, which lies on the surface of the skin. As you sweat the water secreted is evaporated from the surface of your skin. This takes heat away from the skin – cooling it.
• shivering


  Muscles in your body contract quickly – this is shivering. 

  Energy for muscle contraction is released by respiration

  Releases heat energy to warm the body