Lesson 7.5.1
7.5.1 Negative and positive feedback and homeostasis during exercise Quiz: Pearson Edexcel Biology, Unit 7
20 questions
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Lesson 7.5.1, Negative and positive feedback and homeostasis during exercise: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 7: Run for your Life, written with Revision Ninja.
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The 20 questions
-
What is the main outcome of a negative feedback mechanism?
- Prevents all changes
- Amplifies initial changes
- Causes continuous change
- Reverses internal changes
-
What is the primary physiological outcome of a positive feedback mechanism?
- Maintains constant set-point
- Stops hormonal secretion
- Amplifies initial changes
- Reverses initial changes
-
What term describes the maintenance of a stable internal environment in organisms?
- Thermoregulation
- Homeostasis
- Osmoregulation
- Metabolism
-
Which part of the brain acts as the primary control centre for thermoregulation?
- Medulla oblongata
- Corpus callosum
- Cerebellum
- Hypothalamus
-
Which vascular response in skin arterioles helps lower body temperature during exercise?
- Vasospasm
- Vasodilation
- Vascular spasm
- Vasoconstriction
-
Which response during exercise is an example of negative feedback?
- Blood clotting
- Action potential
- Sweating
- Oxytocin release
-
Which process is an example of a positive feedback mechanism?
- Insulin secretion
- Sweating when hot
- Oxytocin in labour
- Vasodilation in heat
-
Which response lowers core body temperature when a runner overheats?
- Shivering
- Vasoconstriction
- Vasodilation
- Increased metabolism
-
How does the body respond to increased blood carbon dioxide during exercise?
- Constricts bronchioles
- Decreases heart rate
- Increases breathing rate
- Decreases breathing rate
-
What is the primary action of negative feedback in homeostasis?
- Counteracting change
- Preventing all variation
- Amplifying change
- Increasing set point
-
Which hormone is secreted to lower blood glucose concentration back to normal?
- Adrenaline
- Oxytocin
- Glucagon
- Insulin
-
What term describes the target value around which a physiological variable is maintained?
- Set point
- Tolerance limit
- Optimum limit
- Equilibrium constant
-
Which component of a homeostatic system detects changes in the internal environment?
- Receptor
- Effector
- Signalling pathway
- Control centre
-
In a homeostatic control system, which component produces the corrective response?
- Control centre
- Effector
- Receptor
- Stimulus
-
Why is positive feedback unsuitable for maintaining homeostasis?
- It lowers temperature
- It reduces stimuli
- It amplifies changes
- It prevents responses
-
Which brain structure acts as the control centre for thermoregulation?
- Hypothalamus
- Pituitary gland
- Medulla oblongata
- Cerebellum
-
Which physiological response directly generates heat during exposure to cold?
- Sweating
- Vasodilation
- Piloerection
- Shivering
-
Which response occurs via negative feedback when core body temperature drops?
- Vasodilation
- Decreased respiration
- Vasoconstriction
- Sweating
-
Why do homeostatic variables often oscillate around the set point?
- Fixed effector activity
- Continuous positive feedback
- Response time delays
- Absence of receptors
-
Which process reverses a deviation from a set point to restore internal stability?
- Allostatic load
- Positive feedback
- Feedforward control
- Negative feedback
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