18 Questions
What term refers to an organism's ability to sense changes in the external or internal environment and adjust to those changes?
Responsiveness
Which process involves changes in a cell's structure and function from an immature, generalized state to a mature, specialized state?
Differentiation
What is the formation of new cells or new organisms called?
Reproduction
Which term describes the maintenance of a relatively constant environment within the body despite fluctuations in the external or internal environment?
Homeostasis
What is the average body temperature that is mentioned in the text?
$98.6$
What are the measures of body properties that may change in value called?
Variables
Which term describes the normal or average value of a variable in the body?
Set point
What does it mean when a system is regulated by negative-feedback mechanisms?
Deviations from the set point are resisted or reduced
Which of the following is NOT an example of a variable that can have its set point adjusted depending on body activities?
Brain size
What happens to body temperature in relation to the set point during normal regulation?
It increases and decreases slightly around the set point
How do organ systems contribute to maintaining homeostasis in the body?
By helping keep the internal environment relatively constant
Which process results in deviations from the set point becoming smaller in negative-feedback mechanisms?
Negative feedback
What is the main purpose of a negative feedback response in the human organism?
To correct the deviation toward the set point and normal range
Which component of a negative feedback mechanism establishes the set point?
Control center
In homeostatic mechanisms, what can happen if negative-feedback mechanisms fail?
Positive-feedback mechanisms take over
What does a positive feedback mechanism do in response to the original stimulus in the human organism?
Results in an even greater deviation from the set point
Which type of response is sometimes required to return to homeostasis?
Positive feedback response
What can be detrimental instead of helpful regarding positive-feedback mechanisms?
Increasing disease states
Test your knowledge on how homeostatic mechanisms regulate variables such as body temperature, heart rate, and blood glucose levels. Learn about the concept of set point and how the body strives to maintain an ideal normal value for different variables.
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