The Thermostat Quiz
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Questions and Answers

Which of the following components is responsible for monitoring the values of the variable and sending data to the control centre?

  • Stimulus
  • Sensor (correct)
  • Control centre
  • Effector

    • What type of feedback mechanism is used in all the feedback mechanisms that maintain homeostasis?

  • No feedback
  • Positive feedback
  • Negative feedback (correct)
  • Both negative and positive feedback

    • Which of the following is NOT one of the components required to maintain homeostasis?

  • Stimulus
  • Effector (correct)
  • Sensor
  • Control centre

    • What is the purpose of negative feedback in maintaining homeostasis?

    <p>To move the variable back toward the set point</p> Signup and view all the answers

    Which of the following best describes homeostasis?

    <p>The process of maintaining a stable internal environment</p> Signup and view all the answers

    What is the set point for human body temperature?

    <p>About 37 degrees C (98.6 degrees F)</p> Signup and view all the answers

    What is the normal range for body temperature in adults?

    <p>36.5 to 37.5 degrees C (97.7 to 99.5 degrees F)</p> Signup and view all the answers

    Homeostasis is the condition in which a system (such as the human body) is maintained in a more or less steady ______.

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

    The spread of values within which such fluctuations are considered insignificant is called the ______ range.

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

    A thermostat is a commonly cited model of how living systems — including the human body— maintain a steady ______ called homeostasis.

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

    Negative feedback is used to maintain ______.

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

    The ______ is provided by the variable being regulated.

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

    The ______ monitors the values of the variable and sends data on it to the control centre.

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

    The ______ is an organ, gland, muscle, or other structure that acts on the signal from the control centre to move the variable back toward the set point.

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

    Negative feedback is a mechanism that serves to reduce an excessive response and keep a variable within the ______ range.

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

    The hypothalamus in the brain is the human body’s temperature regulatory ______.

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

    Which of the following best describes the purpose of negative feedback in maintaining homeostasis?

    <p>To reduce an excessive response and keep a variable within the normal range</p> Signup and view all the answers

    Which of the following is NOT a characteristic of positive feedback loops in biological systems?

    <p>They maintain homeostasis</p> Signup and view all the answers

    Which of the following is an example of a disease caused by homeostatic imbalance?

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

    Which of the following is the most common type of diabetes in the United States?

    <p>Type 2 diabetes</p> Signup and view all the answers

    What fasting blood glucose level indicates a diagnosis of diabetes?

    <p>Above 125</p> Signup and view all the answers

    What is the risk of death in adults with diabetes compared to adults without diabetes?

    <p>50% greater</p> Signup and view all the answers

    What lifestyle changes can help manage or even reverse type 2 diabetes?

    <p>Lose weight, exercise regularly, and adopt a healthy diet</p> Signup and view all the answers

    Which hormone increases metabolic activity and heat production in cells throughout the body?

    <p>Thyroid hormone</p> Signup and view all the answers

    What is the role of alpha and beta cells in the pancreas in controlling blood glucose levels?

    <p>All of the above</p> Signup and view all the answers

    What type of feedback loop is involved in blood clotting?

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

    What type of feedback loop controls childbirth?

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

    Which of the following is NOT a response of the body when the hypothalamus receives data that body temperature is higher than the set point?

    <p>Blood vessels in the skin contract (vasoconstriction)</p> Signup and view all the answers

    What triggers shivering in the body when the brain's temperature regulatory centre receives data that body temperature is lower than the set point?

    <p>Random signals to skeletal muscles</p> Signup and view all the answers

    What is the role of negative feedback in body temperature regulation?

    <p>To maintain body temperature at the set point</p> Signup and view all the answers

    Which of the following best describes the purpose of positive feedback in biological systems?

    <p>To amplify or reinforce a change or deviation from the set point.</p> Signup and view all the answers

    Which of the following is an example of a negative feedback loop?

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

    What is the role of positive feedback in biological systems?

    <p>To amplify or reinforce a change or deviation from the set point.</p> Signup and view all the answers

    Which type of feedback loop is primarily responsible for maintaining stability and homeostasis within a system?

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

    What is the purpose of a negative feedback loop when there is a deviation from the set point or desired value?

    <p>To reverse the change</p> Signup and view all the answers

    Which type of feedback loop is exemplified by the regulation of body temperature?

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

    Which of the following statements is true about positive feedback loops?

    <p>Positive feedback loops amplify or reinforce changes.</p> Signup and view all the answers

    Which of the following examples demonstrates a positive feedback loop?

    <p>Blood clotting &amp; childbirth</p> Signup and view all the answers

    What is the purpose of positive feedback loops in biological systems?

    <p>To amplify or reinforce changes</p> Signup and view all the answers

    Which step of the scientific method involves setting up a controlled experiment to test a hypothesis?

    <p>Test Your Hypothesis</p> Signup and view all the answers

    What is the purpose of analyzing data in the scientific method?

    <p>To draw a conclusion</p> Signup and view all the answers

    What is the role of a hypothesis in the scientific method?

    <p>To make an educated prediction</p> Signup and view all the answers

    Which of the following is NOT a way to communicate your experiment and findings?

    <p>Sharing your findings on social media</p> Signup and view all the answers

    Why is it important to communicate your experiment and findings?

    <p>To build collective knowledge</p> Signup and view all the answers

    What is the scientific method compared to?

    <p>A roadmap</p> Signup and view all the answers

    Study Notes

    Homeostasis

    • Homeostasis is the condition in which a system (such as the human body) is maintained in a more or less steady state.
    • The set point for human body temperature is around 37°C (98.6°F).
    • The normal range for body temperature in adults is between 36.1°C (97°F) and 37.8°C (100°F).
    • The spread of values within which such fluctuations are considered insignificant is called the normal range.

    Negative Feedback Mechanism

    • Negative feedback is used to maintain homeostasis.
    • Negative feedback reduces an excessive response and keeps a variable within the normal range.
    • The detector monitors the values of the variable and sends data on it to the control centre.
    • The effector is an organ, gland, muscle, or other structure that acts on the signal from the control centre to move the variable back toward the set point.

    Thermoregulation

    • The hypothalamus in the brain is the human body’s temperature regulatory centre.
    • When the hypothalamus receives data that body temperature is higher than the set point, it triggers sweating to cool the body.
    • When the hypothalamus receives data that body temperature is lower than the set point, it triggers shivering to produce heat.

    Diabetes

    • Diabetes is an example of a disease caused by homeostatic imbalance.
    • The most common type of diabetes in the United States is type 2 diabetes.
    • A fasting blood glucose level of 126 mg/dL or higher indicates a diagnosis of diabetes.
    • The risk of death in adults with diabetes compared to adults without diabetes is 2-3 times higher.
    • Lifestyle changes such as weight loss, exercise, and diet can help manage or even reverse type 2 diabetes.

    Feedback Loops

    • Negative feedback loops are exemplified by the regulation of body temperature.
    • Positive feedback loops are involved in blood clotting and childbirth.
    • The purpose of positive feedback in biological systems is to amplify a response.
    • The purpose of negative feedback in maintaining homeostasis is to reduce an excessive response and keep a variable within the normal range.

    Scientific Method

    • The scientific method involves setting up a controlled experiment to test a hypothesis (step 3).
    • The purpose of analyzing data in the scientific method is to draw conclusions and make decisions.
    • The role of a hypothesis in the scientific method is to make a prediction based on observations.
    • Communicating experiment and findings is important to share knowledge and allow others to build upon it.
    • The scientific method is compared to a recipe, with a series of steps to follow to achieve a desired outcome.

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    Test your knowledge on thermostat and its role in maintaining a steady temperature in homes and living systems.

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