Worksheet: Thermoregulation

In this worksheet, we will practice describing the responses of the human body to a change in temperature, and explaining why these responses are important.


What structure detects changes in the external temperature?

  • AThe thermoregulatory center
  • BTemperature receptors in the skin
  • CPressure receptors in the skin
  • DPressure receptors in the heart
  • ETemperature receptors in blood vessels


A change in external temperature is detected by temperature receptors. In what organ are these temperature receptors located?

  • ASkin
  • BLungs
  • CBrain
  • DLiver
  • EHeart


When controlling body temperature, the thermoregulatory center acts as a coordination center. In which organ is the thermoregulatory center located?

  • AHeart
  • BSkin
  • CLiver
  • DLungs
  • EBrain


What structure detects changes in the temperature of the blood?

  • AEffectors in sweat glands
  • BTemperature receptors in the skin
  • CPressure receptors in blood vessels
  • DAtria nerves in the heart
  • EThe thermoregulatory center


Which of the following is a potential negative impact of core body temperature increasing above the optimum?

  • ALess glucose is available for cellular respiration and energy is not transferred in the body.
  • BBlood vessels constrict and restrict blood flow to the skin.
  • CCells take on too much water and plasmolyze (burst).
  • DEnzymes required for key biological processes in the body denature and no longer work.


A common response to an increase in body temperature is sweating. How does sweating help decrease body temperature?

  • AAs sweat is released, it transfers heat energy into movement energy and cools the body down.
  • BAs sweat cools on the skin, it provides an insulating layer that prevents more heat from being absorbed by the skin.
  • CAs sweat is produced from sweat glands, they release radiation that removes heat from the body.
  • DAs sweat evaporates from the skin, it transfers heat energy to the environment and cools the skin.


Which of the following is a response to an increase in body temperature?

  • AShivering
  • BSweating
  • CVasoconstriction
  • DHairs on skin standing upright
  • EPutting more clothes on


Which of the following is a response to a decrease in body temperature?

  • AFinding shade
  • BShivering
  • CThe hair on the skin lying flat
  • DVasodilation
  • ESweating


What is the average, optimum core body temperature of humans in C to the nearest whole number?

  • A40
  • B37
  • C35
  • D30
  • E39


If core body temperature falls, responses are initiated to bring the temperature back to normal. What key feedback mechanism is control of body temperature an example of?

  • ACircular feedback
  • BPositive feedback
  • CRepeated feedback
  • DNegative feedback
  • EAmbivalent feedback

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