WK 3: Thermoregulation
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Questions and Answers

What is the term for the ability of humans and other mammals to maintain a constant body temperature?

  • Thermogenesis
  • Poikilothermy
  • Homeothermy (correct)
  • Osmolality

    • What is the main function of sweat glands in relation to body fluid and temperature homeostasis?

  • To regulate body temperature through shivering
  • To evaporate water and cool the body (correct)
  • To produce heat through metabolic processes
  • To regulate body osmolality

    • What is the primary source of heat generation in neonates?

  • Brown fat (correct)
  • Muscle contractions
  • White fat
  • Shivering

    • What is the term for the regulation of body fluid balances in the face of high temperatures and lack of fluid intake?

    <p>Thermoregulation</p> Signup and view all the answers

    What is the rate of increase in core temperature if excess heat is not dissipated?

    <p>1 oC every 10 min</p> Signup and view all the answers

    Which of the following animals is an example of a poikilothermic organism?

    <p>Reptile</p> Signup and view all the answers

    What is the term for the regulation of the concentration of solutes in bodily fluids?

    <p>Osmolality</p> Signup and view all the answers

    What determines heat loss or gain from the environment?

    <p>Radiation, Conduction, and Convection</p> Signup and view all the answers

    What is the primary mechanism by which sweat glands help to maintain body temperature homeostasis?

    <p>Evaporation of sweat</p> Signup and view all the answers

    What is the maximum duration of exercise without heat dissipation?

    <p>30 min</p> Signup and view all the answers

    What is the maximum core temperature that can be tolerated during exercise?

    <p>40 oC</p> Signup and view all the answers

    How do some animals liberate excess heat?

    <p>By radiation of heat following dilation of cutaneous blood vessels</p> Signup and view all the answers

    What is the primary function of sweat glands in thermoregulation?

    <p>To produce sweat for evaporative cooling</p> Signup and view all the answers

    What is the result of heat gain from the environment?

    <p>Increased body temperature</p> Signup and view all the answers

    What is the primary means of heat loss during exercise in humans?

    <p>Evaporative heat loss from sweating</p> Signup and view all the answers

    What is the primary function of apoeccrine sweat glands in humans?

    <p>To regulate body temperature</p> Signup and view all the answers

    What is the term for the increase in temperature set-point as a result of an infection?

    <p>Pyrogenic hyperthermia</p> Signup and view all the answers

    What is the primary role of cutaneous vasodilatation in humans?

    <p>To increase blood flow to the skin, allowing for heat loss</p> Signup and view all the answers

    What is the primary mechanism of heat loss in kangaroos?

    <p>Evaporative heat loss from licking forearms</p> Signup and view all the answers

    What is the primary function of the preoptic anterior hypothalamus in thermoregulation?

    <p>To detect changes in core temperature</p> Signup and view all the answers

    What is the approximate percentage of cardiac output that skin blood flow is in normothermic conditions?

    <p>5%</p> Signup and view all the answers

    Where is residual brown fat primarily located in adults?

    <p>Under the shoulder blades</p> Signup and view all the answers

    What is the range of variation in core body temperature during the day?

    <p>±1 oC</p> Signup and view all the answers

    How does the basal metabolic rate (BMR) change with age?

    <p>It decreases</p> Signup and view all the answers

    What happens to body temperature during ovulation in women?

    <p>It increases by 0.15-0.45 oC</p> Signup and view all the answers

    How does energy expenditure change during moderate exercise?

    <p>It increases to approximately 600 kcal/h</p> Signup and view all the answers

    What is the approximate energy expenditure at rest?

    <p>80 kcal/h</p> Signup and view all the answers

    What is the primary factor contributing to heat production during exercise?

    <p>Active skeletal muscle</p> Signup and view all the answers

    What is the approximate increase in energy expenditure from rest to moderate exercise?

    <p>600 kcal/h</p> Signup and view all the answers

    What is the primary site of heat production in adults?

    <p>Skeletal muscle</p> Signup and view all the answers

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