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Thermoregulation

Biology • Body Organization & Homeostasis • Knowledge-Based • 5 questions

Thermoregulation Knowledge-Based Download PDF

Biology · Human Body & Physiology · Biology · Body Organization & Homeostasis

5 Biology practice questions on Thermoregulation. Questions that assess core concepts and understanding.

Questions

  1. 1.

    Which mechanism of heat exchange involves the emission of thermal energy between the human body and surrounding objects via electromagnetic waves without direct physical contact?

    • A) Conduction
    • B) Convection
    • C) Radiation
    • D) Evaporation
  2. 2.

    During an infection, pyrogens released into the bloodstream alter human thermoregulation by causing which of the following physiological changes?

    • A) Irreversible destruction of peripheral thermoreceptors in the skin
    • B) Inhibition of sympathetic nerve pathways that stimulate sweat gland secretion
    • C) Decreased cellular metabolic rate within visceral organs to conserve energy
    • D) An increase in the homeostatic temperature set point regulated by the hypothalamus
  3. 3.

    In the negative feedback mechanism that regulates human body temperature, which of the following structures acts directly as an effector?

    • A) Peripheral thermoreceptors in the dermis
    • B) Smooth muscle in dermal arterioles
    • C) Preoptic area of the hypothalamus
    • D) Central thermoreceptors in the spinal cord
  4. 4.

    Which physiological response is triggered by the hypothalamus when human core body temperature rises above the homeostatic set point?

    • A) Vasodilation of cutaneous blood vessels and activation of eccrine sweat glands
    • B) Vasoconstriction of dermal arterioles and contraction of arrector pili muscles
    • C) Involuntary rhythmic contraction of skeletal muscle fibers to generate heat
    • D) Increased secretion of thyroid hormones to elevate basal metabolic rate
  5. 5.

    When human body temperature drops below the homeostatic set point, which of the following responses is coordinated by the hypothalamus to restore thermal balance?

    • A) Dilation of dermal blood vessels and activation of eccrine sweat glands
    • B) Relaxation of skeletal muscles and increased evaporation of moisture from the skin
    • C) Constriction of cutaneous arterioles and involuntary rhythmic contractions of skeletal muscles
    • D) Inhibition of thyroid hormone release and decreased cellular metabolic rate