Homeostasis
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Questions and Answers

What is homeostasis?

  • Maintaining only stable external conditions
  • Maintaining fairly stable internal conditions (correct)
  • Maintaining constantly changing internal conditions
  • Allowing internal conditions to fluctuate widely

    • Which term is used in the video to refer to the 'control center'?

  • Stimulus
  • Effector
  • Sensor
  • Integrating center (correct)

    • Why is it important for our body to maintain homeostasis?

  • To keep external and internal environments exactly the same
  • To ensure optimal cell function under stable conditions (correct)
  • To prevent any changes in our environment
  • To allow blood glucose levels to fluctuate widely

    • What components are involved in a negative feedback mechanism?

    <p>Stimulus, sensor, integrating center, effector</p> Signup and view all the answers

    How do external and internal environments change according to the text?

    <p>They are constantly changing</p> Signup and view all the answers

    What happens to blood glucose levels if you haven't eaten in a while?

    <p>They decrease</p> Signup and view all the answers

    What is the primary purpose of maintaining homeostasis in the body?

    <p>To ensure optimal cell function within a narrow range of conditions</p> Signup and view all the answers

    'Homeostasis' is best described as:

    <p>'Homeostasis' is the body's ability to maintain a stable internal environment</p> Signup and view all the answers

    'Integrating center' and 'control center' refer to:

    <p>'Integrating center' and 'control center' are interchangeable terms describing the same component</p> Signup and view all the answers

    What is the normal range for blood glucose levels in the body?

    <p>60 to 110 mg/dL</p> Signup and view all the answers

    What is the main purpose of negative feedback mechanisms in homeostasis?

    <p>To maintain the factor at its set point</p> Signup and view all the answers

    In a negative feedback mechanism, what is the role of the sensor?

    <p>Receive and detect changes in the factor</p> Signup and view all the answers

    Which hormone is released by the pancreas to raise blood glucose levels?

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

    What factor does the body aim to keep at a specific 'set point'?

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

    Which statement best describes how negative feedback mechanisms operate in homeostasis?

    <p>They counteract the original stimulus to return the factor to its set point</p> Signup and view all the answers

    The normal range for blood glucose levels is typically around 60 to 110 mg/dL.

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

    Homeostasis only operates to maintain factors within a low range of values.

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

    Insulin is released by the pancreas to raise blood glucose levels in the body.

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

    The set point represents an ideal value for a factor that the body does not actively maintain.

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

    Negative feedback mechanisms only work to counteract the original stimulus when the factor is too high.

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

    The regulation of blood pressure is an example of a negative feedback mechanism involving the pancreas.

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

    In response pathways involving the nervous system, how does the sensor typically send input to the integrating center?

    <p>Through afferent pathways via sensory neurons</p> Signup and view all the answers

    Which of the following is NOT a characteristic of response pathways?

    <p>Can only be activated for homeostatic purposes</p> Signup and view all the answers

    What type of molecules are Sensor, integrating center, and target in a response pathway?

    <p>Membrane receptors</p> Signup and view all the answers

    Which of the following is an example of a non-homeostatic purpose for a response pathway?

    <p>Responding to the presence of a friend at the grocery store</p> Signup and view all the answers

    What is the role of the effector in a response pathway?

    <p>Receives output from the integrating center</p> Signup and view all the answers

    How do response pathways exemplify cause and effect relationships?

    <p>By integrating multiple cells and organs</p> Signup and view all the answers

    In a response pathway involving the nervous system, the sensor typically sends input to the integrating center via motor neurons.

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

    Response pathways can only be used for non-homeostatic purposes.

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

    The set point represents an ideal value for a factor that the body actively maintains.

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

    Negative feedback mechanisms always work by amplifying the original stimulus.

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

    Stimulus and response in a response pathway are always external events or actions.

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

    Integration of multiple cells, tissues, organs, and organ systems is not typically seen in response pathways.

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

    What is the difference between local control and long-distance control in the body?

    <p>Local control is restricted to the region where the change took place, while long-distance control involves multiple organs and organ systems.</p> Signup and view all the answers

    Which of the following is an accurate example of local control in the body?

    <p>Dilation of blood vessels in a specific muscle due to decreased oxygen levels</p> Signup and view all the answers

    How does positive feedback differ from negative feedback in terms of response to a stimulus?

    <p>Positive feedback amplifies the original stimulus, while negative feedback counteracts it.</p> Signup and view all the answers

    When a response pathway in the body amplifies the original stimulus and moves the variable farther from the set point, what type of feedback mechanism is being employed?

    <p>Positive feedback</p> Signup and view all the answers

    How does long-distance control differ from local control in terms of coordinating responses?

    <p>Long-distance control uses external organ systems to coordinate responses across multiple organs, unlike local control.</p> Signup and view all the answers

    Which of the following best describes how local control operates in response to a change in a specific region?

    <p>Local control restricts the response to the region where the change occurred.</p> Signup and view all the answers

    In a situation where a response pathway aims to maintain homeostasis by reducing the impact of a stimulus, what type of feedback mechanism is likely at play?

    <p>Negative feedback</p> Signup and view all the answers

    What distinguishes long-distance control from local control in terms of response coordination?

    <p>Long-distance control coordinates responses using external organ systems, while local control operates within the same organ or tissue.</p> Signup and view all the answers

    If a response pathway in the body aims to return a specific variable back to its set point after a deviation, which type of feedback mechanism is likely involved?

    <p>Negative feedback</p> Signup and view all the answers

    What role does positive feedback play in maintaining homeostasis within biological systems?

    <p>It amplifies initial stimuli, moving variables farther from set points.</p> Signup and view all the answers

    In the body, there are three major forms of control systems: local control, long-distance control, and medium-distance control.

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

    Positive feedback mechanisms are commonly seen in the body since they are helpful in maintaining homeostasis.

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

    The response pathway in local control involves external organ systems.

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

    Long-distance control often involves multiple organs and organ systems for body coordination.

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

    Positive feedback amplifies the original stimulus and brings the variable closer to the set point.

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

    Local control mechanisms are mainly used for whole-body regulation.

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

    Long-distance control is an example of a negative feedback mechanism.

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

    A drop in O2 in a given muscle during exercise is an example of long-distance control.

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

    Positive feedback mechanisms are commonly used to counteract deviations from a set point in the body.

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

    Negative feedback mechanisms are primarily responsible for maintaining homeostasis in the body.

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

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