Homeostasis Quiz

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Test your body balance

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Joshua Pading

New Zealand

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Homeostasis Quiz


Homeostasis QuizOnline version Test your body balance by Joshua Pading 1 Define homeostasis. a The body’s response to injury b The body’s ability to maintain stable internal conditions despite changes c The breakdown of nutrients d The process of growth 2 Give one example of the body restoring homeostasis. a Heart rate increases during exercise b The liver releases stored glucose when blood glucose drops returning BGL to normal (4–8 mmol). c Breathing stops during sleep d Muscles contract randomly 3 What are the three components of a feedback loop? a Brain, heart, lungs b Stimulus, response, recovery c Receptor, control centre, effector d 4 Explain negative feedback. a A system that increases change b A system that ignores change c A system that reduces or reverses a change d A system that stops all processes 5 Explain positive feedback. a A system that maintains stability b A system that amplifies a change further away from normal c A system that stops change completely d A system that slows processes down 6 Give two examples of negative feedback. a Temperature regulation and blood glucose regulation b Childbirth and blood clotting c Digestion and respiration d Growth and development 7 Give two examples of positive feedback. a Circulation and movement b Hormone release and digestion c Temperature control and breathing d Childbirth and blood clotting 8 What is the afferent pathway? a Carries messages away from the control centre b Brings about an action to restore balance c Detects changes in the environment d Carries messages towards the control centre 9 What is the efferent pathway? a Carries messages away from the control centre to effectors b Carries messages towards the control centre c Detects stimuli d Acts as a receptor 10 What is the role of affectors (receptors)? a Bring about a response b Carry messages to muscles c Detect change and send signals to the control centre d Adjust bicarbonate levels 11 What systems usually act as the control centre? a Respiratory and digestive systems b Cardiovascular and skeletal systems c Urinary and lymphatic systems d Nervous and endocrine systems 12 Why are muscles and glands considered effectors? a They detect external stimuli b They send signals to the control centre c They bring about actions that restore balance (e.g., sweating, vasodilation, hormone release) d They regulate blood pH 13 Describe the homeostatic steps when the body gets too hot: a Receptors detect heat → afferent pathway → control centre → efferent signal → blood vessels dilate & sweat glands activate (cooling) b Receptors detect heat → control centre → blood vessels constrict → body warms c Effector detects heat → sends signal to receptor d Control centre releases insulin 14 Is temperature regulation negative or positive feedback? Why? a Negative feedback — it reverses the temperature rise to restore normal range b Positive feedback — it increases the temperature further c Neutral feedback — no change occurs d Cyclic feedback — repeats continuously 15 Explain why childbirth is positive feedback. a It reduces hormonal activity b Cervical stretch → release oxytocin → stronger contractions → more stretch → more oxytocin release, until birth ends the cycle c It restores balance immediately d It reverses the process once contractions start 16 Explain why blood clotting is positive feedback. a Platelets dissolve the clot b The body reduces platelet activity c The process stops immediately after injury d Platelets stick to the wound → attract more platelets → increases clot formation until bleeding stops 17 What is the normal blood pH range? a 6.8 – 7.2 b 7.5 – 8.0 c 7.35 – 7.45 d 6.5 – 7.0 18 What is acidosis? a Blood pH below 7.35 (too many H⁺ ions) b Blood pH above 7.45 c Excess bicarbonate levels d Loss of oxygen in blood 19 What is alkalosis? a Blood pH below 7.35 b Blood pH above 7.45 (too few H⁺ ions) c Increase in H⁺ ions d Excess carbon dioxide 20 What is the most common buffer in the body? a Phosphate b Protein c Bicarbonate (HCO₃⁻) acts as a primary buffer in the body, maintaining blood pH balance. d Ammonia 21 What is the role of buffers? a Speed up pH changes b Quickly neutralise strong acids or bases to prevent major pH changes c Produce hydrogen ions d Absorb CO₂ 22 How does the respiratory system regulate pH? a By increasing bicarbonate reabsorption b By controlling kidney function c By releasing hormones d By removing CO₂/H⁺ through breathing — this is fast 23 How does the renal system regulate pH? a By exhaling more CO₂ b By removing H⁺ and adjusting bicarbonate levels through urine — this is slow c By sweating d By stimulating muscles 24 Why is homeostasis less effective in older adults? a Stronger feedback loops and faster responses b Increased hormonal activity c Slower, less sensitive feedback loops; decline in endocrine control; reduced organ efficiency; more disease/medication effects d Enhanced thermoregulation 25 Example of an internal factor disrupting homeostasis: a Low blood glucose, dehydration, illness b Cold weather c Heat exposure d Toxins 26 Example of an external factor disrupting homeostasis: a Low blood sugar b Dehydration c Hormone imbalance d Cold weather, heat, toxins

Homeostasis Quiz

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Homeostasis QuizOnline version

by Joshua Pading

Define homeostasis.

Give one example of the body restoring homeostasis.

What are the three components of a feedback loop?

Explain negative feedback.

Explain positive feedback.

Give two examples of negative feedback.

Give two examples of positive feedback.

What is the afferent pathway?

What is the efferent pathway?

What is the role of affectors (receptors)?

What systems usually act as the control centre?

Why are muscles and glands considered effectors?

Describe the homeostatic steps when the body gets too hot:

Is temperature regulation negative or positive feedback? Why?

Explain why childbirth is positive feedback.

Explain why blood clotting is positive feedback.

What is the normal blood pH range?

What is acidosis?

What is alkalosis?

What is the most common buffer in the body?

What is the role of buffers?

How does the respiratory system regulate pH?

How does the renal system regulate pH?

Why is homeostasis less effective in older adults?

Example of an internal factor disrupting homeostasis:

Example of an external factor disrupting homeostasis: