WorksheetsIntroduction to Caffeine
Total questions: 20
Worksheet time: 10mins
What type of drug is caffeine primarily classified as in the body?
A stimulant that increases alertness
A depressant that slows signals
An analgesic that reduces pain
An antibiotic that kills bacteria
Which everyday items are common sources of caffeine for many people?
Coffee, tea, cola, chocolate
Milk, water, bread, pasta
Apples, carrots, rice, beans
Cheese, yogurt, butter, cream
In the game, students estimate whether a product has higher or lower caffeine than a reference. Which reference amount was mentioned for tea?
About 50 milligrams per cup
About 5 milligrams per cup
About 150 milligrams per cup
About 500 milligrams per cup
During the activity, which product surprisingly contained a whacking 520 milligrams of caffeine?
A strong energy drink can
A mug of filtered coffee
A bar of dark chocolate
An espresso single shot
Reason about this: If a mug of filtered coffee is discussed around 100 milligrams, which product would most likely have lower caffeine than that mug?
A standard espresso serving
A large energy drink can
Eight strong paracetamol tablets
A concentrated cold-brew bottle
You must decide quickly in the game. If cola is compared to a 50 mg cup of tea, which choice matches the dialogue outcome?
Cola is lower than the tea cup
Cola is equal to the tea cup
Cola is higher than the tea cup
Cola has zero caffeine always
Strategize: When estimating caffeine levels without labels, which tactic would best improve your 'higher or lower' choices across products?
Use known typical ranges for drinks
Always guess higher for safety
Choose the largest package size
Ignore prior results and randomize
What is adenosine’s main effect on the brain during wakefulness?
It slows neural activity, increasing sleepiness
It speeds neural activity, boosting alertness
It releases glucose, fueling muscle strength
It blocks dopamine, reducing motivation
Why can caffeine prevent you from feeling sleepy shortly after consumption?
It blocks adenosine receptors on neurons
It increases adenosine production in blood
It destroys adenosine molecules completely
It turns adenosine into adrenaline directly
Which statement best describes caffeine’s molecular relationship to adenosine?
It has a similar shape and fits receptors
It is unrelated and uses different pathways
It is larger and dissolves adenosine quickly
It is identical and becomes adenosine later
What immediate body response can follow the brain thinking 'I shouldn’t be feeling tired' after caffeine blocks adenosine?
Release of the hormone adrenaline
Shutdown of nervous system signals
Drop in body temperature drastically
Increase in melatonin production
What effect does adrenaline have that relates to caffeine’s 'energy boost'?
It ramps up alertness and readiness
It lowers heart rate and calmness
It increases hunger and digestion
It reduces breathing and oxygen
Which sequence correctly shows the chain of events after drinking coffee?
Caffeine blocks receptors, brain feels alert, adrenaline rises
Adenosine binds strongly, neurons slow, adrenaline falls
Caffeine makes adenosine, neurons tire, sleep pressure drops
Receptors multiply instantly, adenosine decreases, calm increases
What is the best explanation for caffeine tolerance with frequent use?
Neurons grow extra adenosine receptors over time
Caffeine molecules shrink and work less over time
Adrenaline permanently stops being released later
Adenosine disappears and cannot bind anymore
If a person develops more adenosine receptors from daily caffeine, what must they often do to feel the same alertness?
Drink more coffee to block more receptors
Sleep less because receptors prevent sleep
Avoid water so caffeine stays concentrated
Take sugar so adenosine binds more easily
Which option describes adenosine binding without caffeine present?
Adenosine attaches, neurons slow, sleepiness increases
Adenosine detaches, neurons speed, alertness increases
Adenosine dissolves, neurons stop, paralysis increases
Adenosine converts, neurons spark, euphoria increases
Why doesn’t adenosine bind effectively after someone drinks coffee?
Caffeine occupies the adenosine receptors
Adenosine becomes inactive immediately
Receptors temporarily vanish entirely
Neurons stop producing receptors altogether
Which misconception is corrected by the mechanism of caffeine?
Caffeine does not add energy; it blocks sleep signals
Caffeine directly creates sleep by adding adenosine
Caffeine always lowers hormone levels like adrenaline
Caffeine melts receptors to remove tiredness forever
A student says, 'Caffeine works because it destroys adenosine in the brain.' What is the better reasoning?
It competes for and blocks adenosine receptors
It breaks adenosine into harmless water
It prevents the brain from making adenosine
It turns adenosine into useful glucose
After weeks of heavy coffee drinking, why might the same cup feel weaker?
More receptors allow adenosine to bind despite caffeine
Caffeine molecules stop reaching the bloodstream entirely
Adrenaline no longer exists in the body at all
Adenosine is completely gone, removing any effect
