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?

To move the variable back toward the set point Signup and view all the answers

Which of the following best describes homeostasis?

The process of maintaining a stable internal environment Signup and view all the answers

What is the set point for human body temperature?

About 37 degrees C (98.6 degrees F) Signup and view all the answers

What is the normal range for body temperature in adults?

36.5 to 37.5 degrees C (97.7 to 99.5 degrees F) 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 ______.

state Signup and view all the answers

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

normal 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.

temperature Signup and view all the answers

Negative feedback is used to maintain ______.

homeostasis Signup and view all the answers

The ______ is provided by the variable being regulated.

stimulus Signup and view all the answers

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

sensor 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.

effector 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.

normal Signup and view all the answers

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

centre Signup and view all the answers

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

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

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

They maintain homeostasis Signup and view all the answers

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

Diabetes Signup and view all the answers

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

Type 2 diabetes Signup and view all the answers

What fasting blood glucose level indicates a diagnosis of diabetes?

Above 125 Signup and view all the answers

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

50% greater Signup and view all the answers

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

Lose weight, exercise regularly, and adopt a healthy diet Signup and view all the answers

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

Thyroid hormone Signup and view all the answers

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

All of the above Signup and view all the answers

What type of feedback loop is involved in blood clotting?

Positive feedback Signup and view all the answers

What type of feedback loop controls childbirth?

Positive feedback 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?

Blood vessels in the skin contract (vasoconstriction) 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?

Random signals to skeletal muscles Signup and view all the answers

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

To maintain body temperature at the set point Signup and view all the answers

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

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

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

Regulation of body temperature Signup and view all the answers

What is the role of positive feedback in biological systems?

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

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

Negative feedback loop 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?

To reverse the change Signup and view all the answers

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

Negative feedback loop Signup and view all the answers

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

Positive feedback loops amplify or reinforce changes. Signup and view all the answers

Which of the following examples demonstrates a positive feedback loop?

Blood clotting & childbirth Signup and view all the answers

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

To amplify or reinforce changes Signup and view all the answers

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

Test Your Hypothesis Signup and view all the answers

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

To draw a conclusion Signup and view all the answers

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

To make an educated prediction Signup and view all the answers

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

Sharing your findings on social media Signup and view all the answers

Why is it important to communicate your experiment and findings?

To build collective knowledge Signup and view all the answers

What is the scientific method compared to?

A roadmap 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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Description

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