Feedback Loop In Biology Quiz

6 Questions | Total Attempts: 6718

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Feedback Loop In Biology Quiz - Quiz

In biology, the feedback loop is a loop system in which the level of one substance influences the level of another, and a mechanism that tends to initiate or inhibit a process. How much do you know about the system?


Questions and Answers
  • 1. 
    Another example of feedback is seen in childbirth, where stretching of the uterus triggers the secretion of a hormone , oxytocin, which stimulates uterine contractions and speeds up labor. 
    • A. 

      This is a positive feedback loop

    • B. 

      This is a negative feedback loop

    • C. 

      This is not a feedback loop

  • 2. 
    Feedback is seen in protein digestion, where the presence of partially digested protein in the stomach triggers the secretion of hydrochloric acid and pepsin, the enzyme that digests protein. Pepsin digests proteins, casing more HCl and pepsin to be released.
    • A. 

      This is a positive feedback loop

    • B. 

      This is a negative feedback loop

    • C. 

      This is not a feedback loop

  • 3. 
    The body senses that substance A is low in the bloodstream.  The brain sends a signal to organ B that causes it to make more hormone A until the level of A is within normal limits.
    • A. 

      This is a positive feedback loop

    • B. 

      This is a negative feedback loop

    • C. 

      This is not a feedback loop

  • 4. 
    The body senses that levels of substance C is high in the bloodstream.  The brain sends a signal to organ D that causes it to make less substance C until the level of substance C is within normal limits.
    • A. 

      This is a positive feedback loop

    • B. 

      This is a negative feedback loop

    • C. 

      This is not a feedback loop

  • 5. 
    The kidneys sense that the oxygen levels in the blood are low.  The kidney sends a hormone signal to the bone marrow to make more red blood cells.  The number of red blood cells increases, so more oxygen is carried in the blood.
    • A. 

      This is a positive feedback loop

    • B. 

      This is a negative feedback loop

    • C. 

      This is not a feedback loop

  • 6. 
    The body senses that there is too much substance X in the blood.  The brain sends a message to organ Y to metabolize substance X.  The brain keeps sending this signal until the levels of substance X is within normal limits.
    • A. 

      This is a positive feedback loop

    • B. 

      This is a negative feedback loop

    • C. 

      This is not a feedback loop

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