Blood Pressure
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40 free Blood Pressure trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Blood pressure is the one health measurement almost everybody has had taken and few people could explain. A cuff tightens, a screen shows two figures, and somebody says whether they look fine. Behind that routine sit three centuries of odd experiments, accidental drug discoveries and some surprising animal physiology. This quiz covers the whole subject. Some questions ask what a reading actually measures and what the two figures stand for. Others deal with monitoring: how a cuff should fit, how to prepare, and why results at a clinic can differ from those at home. There are questions on food, medicines and the conditions linked to raised and low readings, plus the people who worked out how to measure it. It is pitched at curious general players, and it also works as a quick self-test for nursing, medical and cardio students. The first questions are the gentlest, later ones go deeper into physiology, and every answer comes with a short explanation. It is trivia, not medical advice.
30 of 40 questions with answers and explanations. Play the quiz
Q 01Which African mammal's heart must generate roughly double human blood pressure to keep its brain supplied?
Giraffe
Giraffe hearts weigh about 11 kg, with walls up to 7.5 cm thick, because every beat has to push blood up a neck some two metres long.
Q 02The first ACE inhibitor, a common type of blood pressure drug, was modelled on a peptide in which animal's venom?
A pit viper
A pit viper from Brazil, the jararaca, kills partly by making its prey's blood pressure collapse. Chemists copied the venom peptide to make captopril in 1975.
Q 03Which Pfizer drug, launched in the 1990s, was first studied as a treatment for high blood pressure and angina?
Viagra
Viagra, or sildenafil, did little for angina in early trials, but the volunteers reported an unexpected side effect. Pfizer switched its target to erectile dysfunction.
Q 04What nickname does the WHO give high blood pressure, since most people who have it feel no symptoms?
The silent killer
The silent killer is a major cause of early death worldwide, yet hundreds of millions of adults who have it are unaware. The only way to know is to have a reading taken.
Q 05Which fruit's juice can dangerously boost the dose of some blood pressure pills, such as felodipine, in the bloodstream?
Grapefruit
Grapefruit juice was caught doing this by accident in 1989, when researchers used it to hide the taste of alcohol in a drug study. One small glass can be enough.
Q 06Which piece of medical clothing names the effect where blood pressure reads higher in a clinic than at home?
White coat
White coat hypertension is put down to the anxiety of a clinic visit. The reverse pattern, fine at the clinic but raised in daily life, is called masked hypertension.
Q 07Clergyman Stephen Hales gauged blood pressure by letting blood climb a nine-foot glass tube from which animal?
Horse
Horse blood climbed more than eight feet up the tube, which Hales had fixed to an artery in a mare's leg. He published his results in 1733.
Q 08Which sweet contains glycyrrhizin, a compound that can raise blood pressure when a lot is eaten for weeks?
Licorice
Licorice gets much of its sweetness from glycyrrhizin, which is 30 to 50 times sweeter than sugar. Overindulging is a recognised cause of unexplained hypertension.
Q 09The Hg in mmHg, the unit printed on every blood pressure reading, is the chemical symbol for which element?
Mercury
Mercury takes the symbol Hg from its Latin name, hydrargyrum. One mmHg was defined as the pressure that holds up a column of the metal one millimetre high.
Q 10Which US president was found to have high blood pressure and heart failure a year before dying in office?
Franklin D. Roosevelt
Franklin D. Roosevelt was examined at Bethesda Hospital in March 1944, then ran for and won a fourth term that November. He died the following April, aged 63.
Q 11Which instrument, devised by Samuel von Basch in 1881, is the standard cuff-and-gauge tool for taking blood pressure?
Sphygmomanometer
Sphygmomanometer is the formal term for what most people call a blood pressure monitor or gauge. Versions with a dial need regular calibration checks to stay accurate.
Q 12In a blood pressure reading such as 120 over 80, the lower number captures what moment in the heart's cycle?
Between heartbeats
Between heartbeats the heart relaxes and refills, so the diastolic figure is the minimum in the cycle. The higher systolic figure is the peak as the heart pumps.
Q 13Which pair of organs helps control blood pressure by releasing renin, an enzyme that starts a pressure-raising cascade?
Q 21The standard upper-arm cuff reads blood pressure from which artery, which runs down to the crook of the elbow?
Brachial
Brachial artery pressure is what the phrase blood pressure means whenever nothing else is specified. The listener's stethoscope goes on the inner elbow, just below the cuff.
Q 22The thumping sounds heard as a blood pressure cuff deflates carry the name of which Russian physician?
Korotkoff
Korotkoff reported the sounds in 1905 while working in St Petersburg. The first thump marks the upper number, and the moment they fade out marks the lower one.
Q 23A blood pressure cuff that is too small for the patient's arm tends to have what effect on the reading?
Too high
Kidneys
Kidneys release renin when they sense the pressure of the blood flowing into them falling. Disease in these organs is one of the most common identifiable causes of hypertension.
Q 14Which mineral is linked to lower blood pressure when people eat more of it?
Potassium
Potassium is so abundant in fruit and vegetables that eleven bananas would cover a full day's needs. Studies tie higher intakes to lower readings.
Q 15Which everyday ingredient does the WHO advise adults to keep under five grams a day to hold blood pressure down?
Salt
Salt intake worldwide averages more than double that limit, which is about one teaspoon. Much of it arrives hidden in processed foods such as bread and snacks.
Q 16High blood pressure is the biggest single risk factor for which sudden, often disabling brain emergency?
Stroke
Stroke risk is 35 to 50 percent attributable to high blood pressure. One review found that trimming the lower number by just 5 mmHg cut the danger by about a third.
Q 17Orthostatic hypotension is a fall in blood pressure, often felt as a head rush, triggered by which everyday action?
Standing up
Standing up shifts about 700 ml of blood out of the chest. Vessels in the lower body normally tighten at once to make up for it; when they lag, the reading dips.
Q 18What is the everyday name for vasovagal syncope, when blood pressure plunges at a trigger like the sight of blood?
Fainting
Fainting happens when the nervous system slows the heart and widens blood vessels together, starving the brain of blood. Falling flat restores the flow, so people come round quickly.
Q 19Which type of blood pressure medicine, nicknamed water pills, works by making the body produce more urine?
Diuretics
Diuretics have a quirk: the thiazide kind lowers blood pressure at doses too small to cause much extra urine, so fluid loss is not the whole story.
Q 20Which organ should be emptied before a blood pressure reading, since a full one can skew the result?
Bladder
Bladder fullness is easy to overlook, so the advice is to go first if there is any urge. It also helps to sit upright for five minutes, feet flat on the floor and limbs uncrossed.
Too high is the usual error from an undersized cuff, while an oversized one may read low. Clinics are meant to keep three or four sizes to hand.
Q 24Ambulatory blood pressure monitoring uses a wearable cuff that takes automatic readings over what span?
24 hours
24 hours of readings capture both the daytime pattern and the fall that normally comes with sleep. People whose pressure fails to dip overnight tend to have poorer outcomes.
Q 25Which type of blood pressure gauge, named like the liquid-free barometer, shows its reading on a mechanical dial?
Aneroid
Aneroid gauges are considered safer than the liquid-column type they largely replaced, although inexpensive ones are less accurate.
Q 26Which chamber of the heart produces the upper blood pressure number when it pumps blood into the aorta?
Left ventricle
Left ventricle walls are three to six times thicker than those of its right-hand twin by young adulthood, because it pumps against far greater resistance.
Q 27In which tiny vessels, known as the main site of vascular resistance, does blood pressure drop the most?
Arterioles
Arterioles have muscular walls that tighten or relax to steer the flow. The steep fall across them protects the one-cell-thick capillaries from bursting.
Q 28Which stretch-sensing nerve endings in the carotid sinus and aortic arch alert the brain to blood pressure changes?
Baroreceptors
Baroreceptors are slightly misnamed, since they detect the stretching of the vessel wall rather than pressure itself. Older textbooks call them pressoreceptors.
Q 29What name is given to the gap between systolic and diastolic readings, about 40 mmHg in a healthy adult?
Pulse pressure
Pulse pressure for a textbook 120 over 80 is 40 mmHg. Doctors watch it because a gap of less than a quarter of the upper figure counts as abnormally narrow.
Q 30Why does the upper blood pressure number tend to climb as people grow older, even when the lower one stays normal?
Arteries stiffen
Arteries stiffen with the years and lose their give, so each beat lands harder. A high top figure over a normal bottom one is common enough to have its own name, isolated systolic hypertension.