Physiology Unit 1 Homeostasis

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Physiology Unit 1 Homeostasis - Quiz


Questions and Answers
  • 1. 

    The steps in homeostasis are

  • 2. 

    The three important measurements associated with negative feedback are the ___________ or homeostasis, the ____-____ and ___________ of the receptor.

    Explanation
    Negative feedback is a regulatory mechanism that helps maintain stability in a system. In this context, the three important measurements associated with negative feedback are: the range, which refers to the acceptable limits within which the system can operate; the set-point, which is the desired value or target that the system aims to maintain; and the sensitivity of the receptor, which determines how responsive the system is to changes in the input. These measurements work together to ensure that the system stays within the desired range and adjusts accordingly to maintain homeostasis.

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  • 3. 

    A regulatory mechanism in which the response to a stimulus, in a control system, causes the controlled variable to move furthur from a steady state. 

    • A.

      Extrinsic

    • B.

      Intrinsic

    • C.

      Negative feed back

    • D.

      Positive feedback

    Correct Answer
    D. Positive feedback
    Explanation
    Positive feedback is a regulatory mechanism in which the response to a stimulus causes the controlled variable to move further from a steady state. In positive feedback, the output or response amplifies the original stimulus, leading to an even greater response. This can result in a runaway effect or exponential growth. Positive feedback loops are often found in biological systems, such as blood clotting or childbirth contractions, where they help to amplify and accelerate certain processes.

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  • 4. 

    Positive feedback usually does not mainatain homeostasis and is long in duration.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Doesn't maintain homeostasis, but is short in duration and infrequent.

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  • 5. 

    What are the two types of homeostasis regulatory mechanisms

    Correct Answer
    Extrinsic, intrinsic
    Explanation
    Extrinsic and intrinsic are the two types of homeostasis regulatory mechanisms. Extrinsic mechanisms involve the involvement of external factors or systems to regulate homeostasis, such as the nervous system and endocrine system. These systems respond to changes in the external environment and send signals to the body to maintain balance. On the other hand, intrinsic mechanisms involve the body's internal mechanisms to regulate homeostasis, such as the autoregulation of blood pressure or the release of hormones in response to changes in blood sugar levels. Both types of mechanisms work together to ensure that the body maintains a stable internal environment.

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  • 6. 

    Which of the following best describes homeostasis?

    • A.

      The process by which organisms change their environment to suit their needs.

    • B.

      The tendency of biological systems to maintain stable internal conditions despite changes in external conditions.

    • C.

      The mechanism by which organisms grow and reproduce.

    • D.

      The ability of organisms to move in response to environmental stimuli.

    Correct Answer
    B. The tendency of biological systems to maintain stable internal conditions despite changes in external conditions.
    Explanation
    Homeostasis is the process by which living organisms regulate their internal environment to maintain a stable, constant condition, despite changes in the external environment. This regulation is crucial for the organism's survival and proper functioning. It involves various feedback mechanisms that control factors such as body temperature, pH levels, glucose concentration, and other vital conditions.

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  • 7. 

    This regulation of an organ is by the nervous system and the endocrine system:

    • A.

      Extrinsic

    • B.

      Intrinsic

    Correct Answer
    A. Extrinsic
    Explanation
    Extrinsic regulation refers to the control of an organ or system by external factors such as the nervous system and the endocrine system. These systems work together to maintain homeostasis and regulate various bodily functions. The nervous system uses electrical signals to transmit information quickly, while the endocrine system uses hormones to carry out slower, long-term regulation. Together, they coordinate and control the activities of organs and systems throughout the body, ensuring that they function properly and respond appropriately to internal and external stimuli.

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  • 8. 

    These regulatory mechanisms are a part of the organ that is being regulated:

    • A.

      Extrinsic

    • B.

      Intrinsic

    Correct Answer
    B. Intrinsic
    Explanation
    Intrinsic regulatory mechanisms refer to the internal processes within an organ that help regulate its functioning. These mechanisms are inherent to the organ itself and do not depend on external factors. They include processes such as autoregulation, where the organ adjusts its own blood flow or pressure based on its needs. Intrinsic regulation is essential for maintaining homeostasis and ensuring that the organ functions optimally.

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  • Current Version
  • Jun 10, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 28, 2011
    Quiz Created by
    Colleennicole
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