Biology Flashcards: Distinguish Feedback Mechanism Types

What this deck covers

This deck focuses on Distinguish Feedback Mechanism Types, giving you a quick way to review the definitions, rules, and examples that matter most for Biology.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: Identify the feedback type: A variable decreases, and the effector response causes it to increase.

Answer: Negative feedback. Response opposes the initial decrease.

Flashcard 2: Which feedback type is generally self-limiting and stops when the variable returns to the set point?

Answer: Negative feedback. It naturally stops at the set point.

Flashcard 3: Identify the feedback type: Low oxygen triggers increased red blood cell production to raise oxygen capacity.

Answer: Negative feedback. Cell production opposes the oxygen deficit.

Flashcard 4: Identify the feedback type: An initial sound near a microphone produces louder speaker output and more sound.

Answer: Positive feedback. Sound amplifies itself in the feedback loop.

Flashcard 5: Identify the feedback type: An initial sound near a microphone produces louder speaker output and more sound.

Answer: Positive feedback. Sound amplifies itself in the feedback loop.

Flashcard 6: Which feedback type counteracts a deviation from the set point by producing an opposite change?

Answer: Negative feedback. It produces an opposing response to deviations.

Flashcard 7: Identify the feedback type: Low blood calcium triggers PTH release to increase blood calcium.

Answer: Negative feedback. PTH opposes the calcium decrease.

Flashcard 8: Which feedback type increases the set point error by pushing the variable farther from the set point?

Answer: Positive feedback. It worsens deviations from the target.

Flashcard 9: Which feedback type is most commonly used to maintain internal stability in organisms?

Answer: Negative feedback. Most biological processes use this for stability.

Flashcard 10: Which feedback type is most commonly used to maintain internal stability in organisms?

Answer: Negative feedback. Most biological processes use this for stability.

Flashcard 11: Identify the feedback type: Bright light causes pupil constriction, reducing light entering the eye.

Answer: Negative feedback. Pupil response opposes the light increase.

Flashcard 12: What is the defining feature of a positive feedback mechanism in regulation?

Answer: A response amplifies the initial stimulus, moving farther from the set point. This accelerates processes toward completion.

Flashcard 13: Identify the feedback type: High blood calcium triggers calcitonin release to lower blood calcium.

Answer: Negative feedback. Calcitonin opposes the calcium increase.

Flashcard 14: Identify the feedback type: A variable decreases, and the effector response causes it to decrease further.

Answer: Positive feedback. Response amplifies the initial decrease.

Flashcard 15: Which feedback type is generally self-limiting and stops when the variable returns to the set point?

Answer: Negative feedback. It naturally stops at the set point.

Flashcard 16: What is a set point in the context of feedback control systems?

Answer: A target value or narrow range a variable is regulated around. The optimal value for system stability.

Flashcard 17: What is the typical outcome of positive feedback on the regulated variable over time?

Answer: Escalation away from the initial state until a stopping event occurs. Variables move farther from starting values.

Flashcard 18: What is the typical outcome of negative feedback on the regulated variable over time?

Answer: Stabilization near the set point (reduced deviation). Variables return to optimal ranges.

Flashcard 19: Choose the word that completes the statement: In negative feedback, the response is   to the stimulus.

Answer: Opposing (counteracting). Response works against the original change.

Flashcard 20: Identify the feedback type: After ovulation, hormones inhibit further LH release to stabilize the cycle.

Answer: Negative feedback. Hormones oppose further LH release.

Flashcard 21: What is the typical outcome of positive feedback on the regulated variable over time?

Answer: Escalation away from the initial state until a stopping event occurs. Variables move farther from starting values.

Flashcard 22: Identify the feedback type: Blood glucose rises and insulin secretion increases to lower glucose.

Answer: Negative feedback. Insulin opposes the glucose increase.

Flashcard 23: Choose the word that completes the statement: In positive feedback, the response is   to the stimulus.

Answer: Reinforcing (amplifying). Response enhances the original change.

Flashcard 24: Identify the feedback type: Blood glucose falls and glucagon secretion increases to raise glucose.

Answer: Negative feedback. Glucagon opposes the glucose decrease.

Flashcard 25: Which feedback type produces a change in the same direction as the initial stimulus?

Answer: Positive feedback. It reinforces the original change direction.

Flashcard 26: Which feedback type is more likely to cause instability if it is not terminated appropriately?

Answer: Positive feedback. It can escalate uncontrollably without limits.

Flashcard 27: Identify the feedback type: A variable increases, and the effector response causes it to decrease.

Answer: Negative feedback. Response opposes the initial increase.

Flashcard 28: Identify the feedback type: Increased CO$_2$ in blood increases breathing rate to lower CO$_2$.

Answer: Negative feedback. Breathing opposes the $CO_2$ increase.

Flashcard 29: Identify the feedback type: Blood osmolarity rises and ADH release increases water reabsorption.

Answer: Negative feedback. ADH opposes the osmolarity increase.

Flashcard 30: Identify the stopping event in blood clotting positive feedback at a wound site.

Answer: Sealing of the break in the vessel, removing the stimulus for platelet recruitment. Vessel repair removes the clotting stimulus.

Flashcard 31: Which feedback type usually requires an external stopping condition to end the loop?

Answer: Positive feedback. It continues until an external event stops it.

Flashcard 32: Identify the feedback type: Platelets release chemicals that attract more platelets to a wound.

Answer: Positive feedback. Platelets recruit more platelets, amplifying.

Flashcard 33: What is the main purpose of negative feedback loops in living systems?

Answer: To maintain homeostasis by keeping variables within narrow limits. It ensures stability of vital parameters.

Flashcard 34: Choose the word that completes the statement: In positive feedback, the response is   to the stimulus.

Answer: Reinforcing (amplifying). Response enhances the original change.

Flashcard 35: What is the key criterion to classify a loop as positive or negative feedback?

Answer: Whether the response amplifies or reduces the initial change in the variable. Direction determines the feedback type.

Flashcard 36: Identify the feedback type: A variable decreases, and the effector response causes it to increase.

Answer: Negative feedback. Response opposes the initial decrease.

Flashcard 37: Which feedback type typically drives a process rapidly to completion rather than stabilizing it?

Answer: Positive feedback. It accelerates rather than stabilizes processes.

Flashcard 38: Identify the feedback type: Increased CO$_2$ in blood increases breathing rate to lower CO$_2$.

Answer: Negative feedback. Breathing opposes the $CO_2$ increase.

Flashcard 39: Which feedback type usually requires an external stopping condition to end the loop?

Answer: Positive feedback. It continues until an external event stops it.

Flashcard 40: Identify the feedback type: Platelets release chemicals that attract more platelets to a wound.

Answer: Positive feedback. Platelets recruit more platelets, amplifying.

Flashcard 41: Identify the feedback type: After ovulation, hormones inhibit further LH release to stabilize the cycle.

Answer: Negative feedback. Hormones oppose further LH release.

Flashcard 42: What is the control center role in a feedback mechanism?

Answer: It compares the variable to the set point and determines a response. The decision-making component of the system.

Flashcard 43: Identify the feedback type: A variable increases, and the effector response causes it to increase further.

Answer: Positive feedback. Response amplifies the initial increase.

Flashcard 44: Identify the feedback type: A variable decreases, and the effector response causes it to decrease further.

Answer: Positive feedback. Response amplifies the initial decrease.

Flashcard 45: Identify the feedback type: High blood calcium triggers calcitonin release to lower blood calcium.

Answer: Negative feedback. Calcitonin opposes the calcium increase.

Flashcard 46: Which option best describes positive feedback: amplifies change or reduces change?

Answer: Amplifies change. It reinforces and increases deviations.

Flashcard 47: What is the stimulus in a biological feedback loop?

Answer: A change in a regulated variable that is detected by receptors. The initial deviation that triggers the response.

Flashcard 48: Which feedback type is more likely to cause instability if it is not terminated appropriately?

Answer: Positive feedback. It can escalate uncontrollably without limits.

Flashcard 49: Identify the feedback type: A thermostat turns heating off when room temperature exceeds the set point.

Answer: Negative feedback. Heating stops when temperature is restored.

Flashcard 50: What is the defining feature of a positive feedback mechanism in regulation?

Answer: A response amplifies the initial stimulus, moving farther from the set point. This accelerates processes toward completion.

Flashcard 51: Which feedback type minimizes the set point error by driving the variable back toward the set point?

Answer: Negative feedback. It corrects deviations from the target.

Flashcard 52: Which feedback type counteracts a deviation from the set point by producing an opposite change?

Answer: Negative feedback. It produces an opposing response to deviations.

Flashcard 53: Identify the feedback type: Low blood calcium triggers PTH release to increase blood calcium.

Answer: Negative feedback. PTH opposes the calcium decrease.

Flashcard 54: Which feedback type is commonly associated with rapid events like action potentials and clotting cascades?

Answer: Positive feedback. It drives rapid, all-or-nothing responses.

Flashcard 55: Identify the feedback type: A variable increases, and the effector response causes it to decrease.

Answer: Negative feedback. Response opposes the initial increase.

Flashcard 56: Identify the feedback type: Decreased CO$_2$ in blood decreases breathing rate to raise CO$_2$.

Answer: Negative feedback. Breathing opposes the $CO_2$ decrease.

Flashcard 57: Identify the feedback type: Bright light causes pupil constriction, reducing light entering the eye.

Answer: Negative feedback. Pupil response opposes the light increase.

Flashcard 58: What is the control center role in a feedback mechanism?

Answer: It compares the variable to the set point and determines a response. The decision-making component of the system.

Flashcard 59: Identify the feedback type: Blood glucose falls and glucagon secretion increases to raise glucose.

Answer: Negative feedback. Glucagon opposes the glucose decrease.

Flashcard 60: Identify the feedback type: Blood pressure rises and heart rate decreases to lower pressure.

Answer: Negative feedback. Heart rate opposes the pressure increase.

Flashcard 61: Identify the feedback type: Rising estrogen near ovulation triggers an LH surge that increases ovulation signals.

Answer: Positive feedback. Estrogen amplifies the ovulation signal.

Flashcard 62: What is the receptor (sensor) role in a feedback mechanism?

Answer: It detects a change in the regulated variable and sends information onward. The sensor component of feedback loops.

Flashcard 63: Which option best describes positive feedback: amplifies change or reduces change?

Answer: Amplifies change. It reinforces and increases deviations.

Flashcard 64: What is the stimulus in a biological feedback loop?

Answer: A change in a regulated variable that is detected by receptors. The initial deviation that triggers the response.

Flashcard 65: Which feedback type is most associated with maintaining homeostasis of temperature, glucose, and pH?

Answer: Negative feedback. It maintains stable internal conditions.

Flashcard 66: Which feedback type produces a change in the same direction as the initial stimulus?

Answer: Positive feedback. It reinforces the original change direction.

Flashcard 67: Identify the feedback type: Neuron depolarization opens Na$^+$ channels, causing more depolarization.

Answer: Positive feedback. Depolarization amplifies itself through channels.

Flashcard 68: What is the defining feature of a negative feedback mechanism in homeostasis?

Answer: A response reduces the initial stimulus and returns toward a set point. This counteracts changes to maintain stability.

Flashcard 69: Choose the word that completes the statement: In negative feedback, the response is   to the stimulus.

Answer: Opposing (counteracting). Response works against the original change.

Flashcard 70: What is a set point in the context of feedback control systems?

Answer: A target value or narrow range a variable is regulated around. The optimal value for system stability.

Flashcard 71: Identify the feedback type: Body temperature rises and sweating increases to cool the body.

Answer: Negative feedback. Sweating opposes the temperature rise.

Flashcard 72: What is the effector role in a feedback mechanism?

Answer: It carries out the response that changes the regulated variable. The component that produces the actual response.

Flashcard 73: Which option best describes negative feedback: amplifies change or reduces change?

Answer: Reduces change. It opposes and minimizes deviations.

Flashcard 74: Which feedback type is most associated with maintaining homeostasis of temperature, glucose, and pH?

Answer: Negative feedback. It maintains stable internal conditions.

Flashcard 75: Identify the feedback type: Blood glucose rises and insulin secretion increases to lower glucose.

Answer: Negative feedback. Insulin opposes the glucose increase.

Flashcard 76: Identify the feedback type: A variable increases, and the effector response causes it to increase further.

Answer: Positive feedback. Response amplifies the initial increase.

Flashcard 77: Identify the feedback type: Oxytocin causes stronger uterine contractions, releasing more oxytocin.

Answer: Positive feedback. Each contraction amplifies the next.

Flashcard 78: What is the main purpose of negative feedback loops in living systems?

Answer: To maintain homeostasis by keeping variables within narrow limits. It ensures stability of vital parameters.

Flashcard 79: Identify the feedback type: Blood pressure rises and heart rate decreases to lower pressure.

Answer: Negative feedback. Heart rate opposes the pressure increase.

Flashcard 80: What is the typical outcome of negative feedback on the regulated variable over time?

Answer: Stabilization near the set point (reduced deviation). Variables return to optimal ranges.

Flashcard 81: What is the key criterion to classify a loop as positive or negative feedback?

Answer: Whether the response amplifies or reduces the initial change in the variable. Direction determines the feedback type.

Flashcard 82: What term describes the difference between the set point and the actual value of a regulated variable?

Answer: Deviation (error) from the set point. The gap between actual and desired values.

Flashcard 83: Identify the stopping event in childbirth positive feedback involving oxytocin.

Answer: Delivery of the baby (and placenta), ending cervical stretch. Birth removes the cervical stretch stimulus.

Flashcard 84: Identify the feedback type: Body temperature rises and sweating increases to cool the body.

Answer: Negative feedback. Sweating opposes the temperature rise.

Flashcard 85: Identify the feedback type: A thermostat turns heating off when room temperature exceeds the set point.

Answer: Negative feedback. Heating stops when temperature is restored.

Flashcard 86: Which feedback type is commonly associated with rapid events like action potentials and clotting cascades?

Answer: Positive feedback. It drives rapid, all-or-nothing responses.

Flashcard 87: Identify the feedback type: Decreased CO$_2$ in blood decreases breathing rate to raise CO$_2$.

Answer: Negative feedback. Breathing opposes the $CO_2$ decrease.

Flashcard 88: What term describes the difference between the set point and the actual value of a regulated variable?

Answer: Deviation (error) from the set point. The gap between actual and desired values.

Flashcard 89: Which feedback type increases the set point error by pushing the variable farther from the set point?

Answer: Positive feedback. It worsens deviations from the target.

Flashcard 90: Identify the stopping event in blood clotting positive feedback at a wound site.

Answer: Sealing of the break in the vessel, removing the stimulus for platelet recruitment. Vessel repair removes the clotting stimulus.

Flashcard 91: Identify the feedback type: Blood osmolarity rises and ADH release increases water reabsorption.

Answer: Negative feedback. ADH opposes the osmolarity increase.

Flashcard 92: Identify the stopping event in childbirth positive feedback involving oxytocin.

Answer: Delivery of the baby (and placenta), ending cervical stretch. Birth removes the cervical stretch stimulus.

Flashcard 93: What is the defining feature of a negative feedback mechanism in homeostasis?

Answer: A response reduces the initial stimulus and returns toward a set point. This counteracts changes to maintain stability.

Flashcard 94: Which option best describes negative feedback: amplifies change or reduces change?

Answer: Reduces change. It opposes and minimizes deviations.

Flashcard 95: Identify the feedback type: Neuron depolarization opens Na$^+$ channels, causing more depolarization.

Answer: Positive feedback. Depolarization amplifies itself through channels.

Flashcard 96: Which feedback type minimizes the set point error by driving the variable back toward the set point?

Answer: Negative feedback. It corrects deviations from the target.

Flashcard 97: Identify the feedback type: Rising estrogen near ovulation triggers an LH surge that increases ovulation signals.

Answer: Positive feedback. Estrogen amplifies the ovulation signal.