Quizmo

Quiz on The Heart

20 questions · June 28, 2026

Below is the full Quizmo quiz devoted to the theme "The Heart": each question, its four options, the correct answer highlighted and, where available, its source. A chance to brush up on your general knowledge and then test what you know.

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Question 1

Easy

How many chambers does the human heart have?

Source: Four chambers: two atria on top, two ventricles below, working as a double pump.

Question 2

Easy

Roughly what size is an adult human heart?

Source: About the size of a clenched fist, and it grows roughly with your own hand.

Question 3

Easy

What type of tissue makes up most of the heart?

Source: The heart is mostly a specialized muscle called cardiac muscle that never tires.

Question 4

Easy

On which side of the chest does the heart mostly sit?

Source: It tilts to the left, which is why we feel a heartbeat more on that side.

Question 5

Easy

Which device delivers a shock to restart a stopped heart?

Source: A defibrillator shocks the heart back into rhythm; a pacemaker only nudges the beat.

Question 6

Easy

What does an ECG actually measure in the heart?

Source: An ECG traces the tiny electrical signals that make each chamber contract in sequence.

Question 7

Easy

Which blood vessels carry blood away from the heart?

Source: Arteries carry blood out; an easy mnemonic is 'A for Away'.

Question 8

Easy

What is a normal resting heart rate for a healthy adult?

Source: Most adults rest between 60 and 100 beats per minute; trained athletes can dip lower.

Question 9

Easy

What is the medical term for a heart attack?

Source: A heart attack is a myocardial infarction; cardiac arrest is when the heart stops entirely.

Question 10

Easy

The higher number in a blood pressure reading reflects the heart doing what?

Source: The top number, systolic pressure, is measured as the heart squeezes blood out.

Question 11

Medium

What does the term 'tachycardia' describe?

Source: Tachycardia means a racing pulse; its opposite, a slow beat, is bradycardia.

Question 12

Medium

Which is the largest artery in the human body?

Source: The aorta is the body's main highway; the vena cava is the largest vein, not artery.

Question 13

Medium

Which chamber pumps oxygen-rich blood to the entire body?

Source: The left ventricle has the thickest walls because it pushes blood everywhere.

Question 14

Medium

What causes the familiar 'lub-dub' sound of a heartbeat?

Source: The two sounds are heart valves snapping shut, not blood whooshing through.

Question 15

Medium

Atrial fibrillation is primarily a disorder of what?

Source: In atrial fibrillation the upper chambers quiver chaotically instead of beating cleanly.

Question 16

Medium

What is the heart's natural pacemaker known as?

Source: The sinoatrial node fires the spark that sets your pulse, all on its own.

Question 17

Medium

Which valve separates the left atrium from the left ventricle?

Source: The mitral valve is the only one with two flaps; the others have three.

Question 18

Hard

Roughly how many times does an average heart beat in a single day?

Source: Around 100,000 beats a day adds up to over 2.5 billion in an average lifetime.

Question 19

Hard

The 'widow-maker' nickname refers to a blockage in which artery?

Source: The left anterior descending feeds most of the heart, so blocking it is often deadly.

Question 20

Hard

Which ion is essential for triggering heart muscle contraction?

Source: Calcium ions flood the muscle cells to make the heart squeeze with each beat.

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