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8 questions
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  • Q1
    The diagram demonstrates a feedback process involving antidiuretic hormone (ADH). ADH increases the permeability of parts of the nephrons of the kidney, resulting in less water in the urine. This feedback loop is likely to be activated when —
    Question Image
    the body experiences dehydration
    body temperature drops
    blood glucose levels are stable
    the urinary tract is infected
    30s
    B.11.A: Homeostasis
  • Q2
    The graph models core body temperature during a rapid change in environmental conditions. Which statement explains the pattern in the graph?
    Question Image
    Vasodilation and vasoconstriction are dependent on the time of day
    Vasodilation and vasoconstriction trigger an immediate increase in body temperature
    Body temperature is controlled by an internal feedback mechanism
    Body temperature varies in a predictable pattern during the day
    30s
    B.11.A: Homeostasis
  • Q3
    When the level of carbon dioxide in the blood is too high, the excess carbon dioxide reacts with water and produces carbonic acid. The carbonic acid causes the blood pH to become more acidic. When the blood pH becomes too acidic, chemoreceptors in the brain instruct the body to react and maintain homeostasis in blood pH. Which of these responses by the body would eliminate the excess carbon dioxide and help maintain homeostasis in blood pH?
    Increasing the body temperature by shivering
    Breathing more deeply and frequently
    Decreasing the heart rate
    Increasing glucose levels in the blood
    30s
    B.11.A: Homeostasis
  • Q4
    The diagram shows the internal feedback mechanism that maintains blood-calcium (Ca2+) homeostasis. If a person has a blood-calcium (Ca2+) level of 8 mg/100 mL of blood, which of the following mechanisms does the body use to maintain blood-calcium homeostasis?
    Question Image
    The intestines increase reabsorption of Ca2+
    The kidneys take up more Ca2+ and release vitamin D
    The bones release Ca2+
    All of the above
    30s
    B.11.A: Homeostasis
  • Q5
    The osmoregulation process is shown below. This process is an example of which of the following?
    Question Image
    Disruption of homeostasis by exercise
    Control of urine production by the parasympathetic nervous system
    Maintenance of homeostasis by a feedback mechanism
    The role of the endocrine system in increasing the oxygen content of red blood cells
    30s
    B.11.A: Homeostasis
  • Q6
    A dog’s pituitary gland produces the hormone ACTH, which stimulates the adrenal glands to secrete cortisol. Cortisol helps regulate body weight, mineral balance, the structure of connective tissue, the production of white blood cells, and skin health. When cortisol levels are low, the pituitary gland secretes ACTH. When cortisol levels are high, the pituitary gland stops secreting ACTH. Based on this information, which of the following would most likely be the cause of elevated levels of cortisol in a dog?
    An excess of ACTH
    An immune response to the excess level of cortisol
    An inactive pituitary gland
    Undersized adrenal glands
    30s
    B.11.A: Homeostasis
  • Q7
    Changes in water pressure within guard cells cause the cells to open or close the stoma. This response helps the plant maintain homeostasis by —
    allowing oxygen needed for photosynthesis to enter the plant
    stabilizing the plant’s temperature through the evaporation of water
    regulating the amount of water the plant loses during transpiration
    enabling the plant to release more carbon dioxide at night for photosynthesis
    30s
    B.11.A: Homeostasis
  • Q8
    An individual who participates in a long-distance run on a hot day will produce large quantities of sweat. As a result of the excessive sweating, the amount of urine produced by the kidneys will change. How will the kidneys respond to help the individual's body maintain homeostasis?
    The kidneys will decrease urine production to allow the body to conserve water.
    The kidneys will increase urine production so the body can absorb more nutrients.
    The kidneys will decrease urine production so the body can maintain blood pH.
    The kidneys will increase urine production to eliminate excess salt in the body.
    60s
    B.11.A: Homeostasis

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