The prefix 'cardio' refers to which organ?
AnswerThe heart
Cardio comes from the Greek 'kardia', meaning heart.
Fitness · Facts & stats
Cardio facts & stats
7 fact-checked facts about cardio exercise and the heart, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does 'aerobic' exercise mean?
AnswerExercise fuelled mainly by oxygen over a sustained period
Aerobic means 'with oxygen': steady activity like brisk walking or cycling relies on oxygen to release energy.
Going deeper
Which chamber of the heart pumps oxygen-rich blood out to the body?
AnswerLeft ventricle
The thick-walled left ventricle is the heart's strongest chamber and pumps oxygen-rich blood around the whole body.
What is the largest artery in the human body?
AnswerThe aorta
The aorta carries blood from the left ventricle and branches to supply the whole body.
What is the exercise that combines a squat, a plank position and a jump called?
AnswerA burpee
A burpee moves from standing to a squat, kicks back to a plank, returns and finishes with a jump.
Expert level
What is the heart's natural pacemaker called?
AnswerThe sinoatrial (SA) node
The SA node in the right atrium sends the electrical signals that start each heartbeat.
Which valve separates the left atrium from the left ventricle?
AnswerThe mitral valve
The mitral valve lets blood flow from the left atrium into the left ventricle and stops it flowing back.
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