Podcast
Questions and Answers
Which of the following components is responsible for monitoring the values of the variable and sending data to the control centre?
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?
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?
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?
What is the purpose of negative feedback in maintaining homeostasis?
Which of the following best describes homeostasis?
Which of the following best describes homeostasis?
What is the set point for human body temperature?
What is the set point for human body temperature?
What is the normal range for body temperature in adults?
What is the normal range for body temperature in adults?
Homeostasis is the condition in which a system (such as the human body) is maintained in a more or less steady ______.
Homeostasis is the condition in which a system (such as the human body) is maintained in a more or less steady ______.
The spread of values within which such fluctuations are considered insignificant is called the ______ range.
The spread of values within which such fluctuations are considered insignificant is called the ______ range.
A thermostat is a commonly cited model of how living systems — including the human body— maintain a steady ______ called homeostasis.
A thermostat is a commonly cited model of how living systems — including the human body— maintain a steady ______ called homeostasis.
Negative feedback is used to maintain ______.
Negative feedback is used to maintain ______.
The ______ is provided by the variable being regulated.
The ______ is provided by the variable being regulated.
The ______ monitors the values of the variable and sends data on it to the control centre.
The ______ monitors the values of the variable and sends data on it to the control centre.
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.
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.
Negative feedback is a mechanism that serves to reduce an excessive response and keep a variable within the ______ range.
Negative feedback is a mechanism that serves to reduce an excessive response and keep a variable within the ______ range.
The hypothalamus in the brain is the human body’s temperature regulatory ______.
The hypothalamus in the brain is the human body’s temperature regulatory ______.
Which of the following best describes the purpose of negative feedback in maintaining homeostasis?
Which of the following best describes the purpose of negative feedback in maintaining homeostasis?
Which of the following is NOT a characteristic of positive feedback loops in biological systems?
Which of the following is NOT a characteristic of positive feedback loops in biological systems?
Which of the following is an example of a disease caused by homeostatic imbalance?
Which of the following is an example of a disease caused by homeostatic imbalance?
Which of the following is the most common type of diabetes in the United States?
Which of the following is the most common type of diabetes in the United States?
What fasting blood glucose level indicates a diagnosis of diabetes?
What fasting blood glucose level indicates a diagnosis of diabetes?
What is the risk of death in adults with diabetes compared to adults without diabetes?
What is the risk of death in adults with diabetes compared to adults without diabetes?
What lifestyle changes can help manage or even reverse type 2 diabetes?
What lifestyle changes can help manage or even reverse type 2 diabetes?
Which hormone increases metabolic activity and heat production in cells throughout the body?
Which hormone increases metabolic activity and heat production in cells throughout the body?
What is the role of alpha and beta cells in the pancreas in controlling blood glucose levels?
What is the role of alpha and beta cells in the pancreas in controlling blood glucose levels?
What type of feedback loop is involved in blood clotting?
What type of feedback loop is involved in blood clotting?
What type of feedback loop controls childbirth?
What type of feedback loop controls childbirth?
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?
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?
What triggers shivering in the body when the brain's temperature regulatory centre receives data that body temperature is lower than the set point?
What triggers shivering in the body when the brain's temperature regulatory centre receives data that body temperature is lower than the set point?
What is the role of negative feedback in body temperature regulation?
What is the role of negative feedback in body temperature regulation?
Which of the following best describes the purpose of positive feedback in biological systems?
Which of the following best describes the purpose of positive feedback in biological systems?
Which of the following is an example of a negative feedback loop?
Which of the following is an example of a negative feedback loop?
What is the role of positive feedback in biological systems?
What is the role of positive feedback in biological systems?
Which type of feedback loop is primarily responsible for maintaining stability and homeostasis within a system?
Which type of feedback loop is primarily responsible for maintaining stability and homeostasis within a system?
What is the purpose of a negative feedback loop when there is a deviation from the set point or desired value?
What is the purpose of a negative feedback loop when there is a deviation from the set point or desired value?
Which type of feedback loop is exemplified by the regulation of body temperature?
Which type of feedback loop is exemplified by the regulation of body temperature?
Which of the following statements is true about positive feedback loops?
Which of the following statements is true about positive feedback loops?
Which of the following examples demonstrates a positive feedback loop?
Which of the following examples demonstrates a positive feedback loop?
What is the purpose of positive feedback loops in biological systems?
What is the purpose of positive feedback loops in biological systems?
Which step of the scientific method involves setting up a controlled experiment to test a hypothesis?
Which step of the scientific method involves setting up a controlled experiment to test a hypothesis?
What is the purpose of analyzing data in the scientific method?
What is the purpose of analyzing data in the scientific method?
What is the role of a hypothesis in the scientific method?
What is the role of a hypothesis in the scientific method?
Which of the following is NOT a way to communicate your experiment and findings?
Which of the following is NOT a way to communicate your experiment and findings?
Why is it important to communicate your experiment and findings?
Why is it important to communicate your experiment and findings?
What is the scientific method compared to?
What is the scientific method compared to?
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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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