Distinguish Feedback Mechanism Types - Biology
Card 1 of 30
What is the typical outcome of negative feedback on the regulated variable over time?
What is the typical outcome of negative feedback on the regulated variable over time?
Tap to reveal answer
Stabilization near the set point (reduced deviation). Variables return to optimal ranges.
Stabilization near the set point (reduced deviation). Variables return to optimal ranges.
← Didn't Know|Knew It →
Which feedback type produces a change in the same direction as the initial stimulus?
Which feedback type produces a change in the same direction as the initial stimulus?
Tap to reveal answer
Positive feedback. It reinforces the original change direction.
Positive feedback. It reinforces the original change direction.
← Didn't Know|Knew It →
Which feedback type is more likely to cause instability if it is not terminated appropriately?
Which feedback type is more likely to cause instability if it is not terminated appropriately?
Tap to reveal answer
Positive feedback. It can escalate uncontrollably without limits.
Positive feedback. It can escalate uncontrollably without limits.
← Didn't Know|Knew It →
Which feedback type typically drives a process rapidly to completion rather than stabilizing it?
Which feedback type typically drives a process rapidly to completion rather than stabilizing it?
Tap to reveal answer
Positive feedback. It accelerates rather than stabilizes processes.
Positive feedback. It accelerates rather than stabilizes processes.
← Didn't Know|Knew It →
Which feedback type is most commonly used to maintain internal stability in organisms?
Which feedback type is most commonly used to maintain internal stability in organisms?
Tap to reveal answer
Negative feedback. Most biological processes use this for stability.
Negative feedback. Most biological processes use this for stability.
← Didn't Know|Knew It →
What is the defining feature of a negative feedback mechanism in homeostasis?
What is the defining feature of a negative feedback mechanism in homeostasis?
Tap to reveal answer
A response reduces the initial stimulus and returns toward a set point. This counteracts changes to maintain stability.
A response reduces the initial stimulus and returns toward a set point. This counteracts changes to maintain stability.
← Didn't Know|Knew It →
What is the main purpose of negative feedback loops in living systems?
What is the main purpose of negative feedback loops in living systems?
Tap to reveal answer
To maintain homeostasis by keeping variables within narrow limits. It ensures stability of vital parameters.
To maintain homeostasis by keeping variables within narrow limits. It ensures stability of vital parameters.
← Didn't Know|Knew It →
Identify the feedback type: A variable decreases, and the effector response causes it to decrease further.
Identify the feedback type: A variable decreases, and the effector response causes it to decrease further.
Tap to reveal answer
Positive feedback. Response amplifies the initial decrease.
Positive feedback. Response amplifies the initial decrease.
← Didn't Know|Knew It →
Identify the feedback type: A variable decreases, and the effector response causes it to increase.
Identify the feedback type: A variable decreases, and the effector response causes it to increase.
Tap to reveal answer
Negative feedback. Response opposes the initial decrease.
Negative feedback. Response opposes the initial decrease.
← Didn't Know|Knew It →
Identify the feedback type: A variable increases, and the effector response causes it to increase further.
Identify the feedback type: A variable increases, and the effector response causes it to increase further.
Tap to reveal answer
Positive feedback. Response amplifies the initial increase.
Positive feedback. Response amplifies the initial increase.
← Didn't Know|Knew It →
Identify the feedback type: A variable increases, and the effector response causes it to decrease.
Identify the feedback type: A variable increases, and the effector response causes it to decrease.
Tap to reveal answer
Negative feedback. Response opposes the initial increase.
Negative feedback. Response opposes the initial increase.
← Didn't Know|Knew It →
What is the key criterion to classify a loop as positive or negative feedback?
What is the key criterion to classify a loop as positive or negative feedback?
Tap to reveal answer
Whether the response amplifies or reduces the initial change in the variable. Direction determines the feedback type.
Whether the response amplifies or reduces the initial change in the variable. Direction determines the feedback type.
← Didn't Know|Knew It →
Identify the feedback type: After ovulation, hormones inhibit further LH release to stabilize the cycle.
Identify the feedback type: After ovulation, hormones inhibit further LH release to stabilize the cycle.
Tap to reveal answer
Negative feedback. Hormones oppose further LH release.
Negative feedback. Hormones oppose further LH release.
← Didn't Know|Knew It →
Identify the feedback type: Rising estrogen near ovulation triggers an LH surge that increases ovulation signals.
Identify the feedback type: Rising estrogen near ovulation triggers an LH surge that increases ovulation signals.
Tap to reveal answer
Positive feedback. Estrogen amplifies the ovulation signal.
Positive feedback. Estrogen amplifies the ovulation signal.
← Didn't Know|Knew It →
Choose the word that completes the statement: In positive feedback, the response is ______ to the stimulus.
Choose the word that completes the statement: In positive feedback, the response is ______ to the stimulus.
Tap to reveal answer
Reinforcing (amplifying). Response enhances the original change.
Reinforcing (amplifying). Response enhances the original change.
← Didn't Know|Knew It →
Choose the word that completes the statement: In negative feedback, the response is ______ to the stimulus.
Choose the word that completes the statement: In negative feedback, the response is ______ to the stimulus.
Tap to reveal answer
Opposing (counteracting). Response works against the original change.
Opposing (counteracting). Response works against the original change.
← Didn't Know|Knew It →
Which feedback type is commonly associated with rapid events like action potentials and clotting cascades?
Which feedback type is commonly associated with rapid events like action potentials and clotting cascades?
Tap to reveal answer
Positive feedback. It drives rapid, all-or-nothing responses.
Positive feedback. It drives rapid, all-or-nothing responses.
← Didn't Know|Knew It →
Which feedback type is most associated with maintaining homeostasis of temperature, glucose, and pH?
Which feedback type is most associated with maintaining homeostasis of temperature, glucose, and pH?
Tap to reveal answer
Negative feedback. It maintains stable internal conditions.
Negative feedback. It maintains stable internal conditions.
← Didn't Know|Knew It →
Identify the feedback type: Low oxygen triggers increased red blood cell production to raise oxygen capacity.
Identify the feedback type: Low oxygen triggers increased red blood cell production to raise oxygen capacity.
Tap to reveal answer
Negative feedback. Cell production opposes the oxygen deficit.
Negative feedback. Cell production opposes the oxygen deficit.
← Didn't Know|Knew It →
Identify the feedback type: Bright light causes pupil constriction, reducing light entering the eye.
Identify the feedback type: Bright light causes pupil constriction, reducing light entering the eye.
Tap to reveal answer
Negative feedback. Pupil response opposes the light increase.
Negative feedback. Pupil response opposes the light increase.
← Didn't Know|Knew It →
Identify the feedback type: Decreased CO$_2$ in blood decreases breathing rate to raise CO$_2$.
Identify the feedback type: Decreased CO$_2$ in blood decreases breathing rate to raise CO$_2$.
Tap to reveal answer
Negative feedback. Breathing opposes the $CO_2$ decrease.
Negative feedback. Breathing opposes the $CO_2$ decrease.
← Didn't Know|Knew It →
Identify the feedback type: Increased CO$_2$ in blood increases breathing rate to lower CO$_2$.
Identify the feedback type: Increased CO$_2$ in blood increases breathing rate to lower CO$_2$.
Tap to reveal answer
Negative feedback. Breathing opposes the $CO_2$ increase.
Negative feedback. Breathing opposes the $CO_2$ increase.
← Didn't Know|Knew It →
Which feedback type increases the set point error by pushing the variable farther from the set point?
Which feedback type increases the set point error by pushing the variable farther from the set point?
Tap to reveal answer
Positive feedback. It worsens deviations from the target.
Positive feedback. It worsens deviations from the target.
← Didn't Know|Knew It →
Which feedback type minimizes the set point error by driving the variable back toward the set point?
Which feedback type minimizes the set point error by driving the variable back toward the set point?
Tap to reveal answer
Negative feedback. It corrects deviations from the target.
Negative feedback. It corrects deviations from the target.
← Didn't Know|Knew It →
What term describes the difference between the set point and the actual value of a regulated variable?
What term describes the difference between the set point and the actual value of a regulated variable?
Tap to reveal answer
Deviation (error) from the set point. The gap between actual and desired values.
Deviation (error) from the set point. The gap between actual and desired values.
← Didn't Know|Knew It →
What is the defining feature of a positive feedback mechanism in regulation?
What is the defining feature of a positive feedback mechanism in regulation?
Tap to reveal answer
A response amplifies the initial stimulus, moving farther from the set point. This accelerates processes toward completion.
A response amplifies the initial stimulus, moving farther from the set point. This accelerates processes toward completion.
← Didn't Know|Knew It →
Identify the feedback type: An initial sound near a microphone produces louder speaker output and more sound.
Identify the feedback type: An initial sound near a microphone produces louder speaker output and more sound.
Tap to reveal answer
Positive feedback. Sound amplifies itself in the feedback loop.
Positive feedback. Sound amplifies itself in the feedback loop.
← Didn't Know|Knew It →
Identify the feedback type: A thermostat turns heating off when room temperature exceeds the set point.
Identify the feedback type: A thermostat turns heating off when room temperature exceeds the set point.
Tap to reveal answer
Negative feedback. Heating stops when temperature is restored.
Negative feedback. Heating stops when temperature is restored.
← Didn't Know|Knew It →
Which option best describes positive feedback: amplifies change or reduces change?
Which option best describes positive feedback: amplifies change or reduces change?
Tap to reveal answer
Amplifies change. It reinforces and increases deviations.
Amplifies change. It reinforces and increases deviations.
← Didn't Know|Knew It →
Which option best describes negative feedback: amplifies change or reduces change?
Which option best describes negative feedback: amplifies change or reduces change?
Tap to reveal answer
Reduces change. It opposes and minimizes deviations.
Reduces change. It opposes and minimizes deviations.
← Didn't Know|Knew It →