How many chambers does the human heart have?
Answer4
The heart has two atria and two ventricles.
Fitness · Facts & stats
Physical facts & stats
7 fact-checked facts about the human body and physical fitness, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Which organs exchange oxygen and carbon dioxide with the blood?
AnswerThe lungs
In the lungs' tiny air sacs, oxygen enters the blood and carbon dioxide leaves it.
Going deeper
What does 'aerobic' exercise mean?
AnswerExercise that relies on oxygen to supply energy
Aerobic means 'with oxygen'; steady activities like walking and swimming are mainly aerobic.
What connects bones to other bones at a joint?
AnswerLigaments
Ligaments are bands of tissue that hold bones together and stabilise joints.
Which molecule do cells use as their immediate energy source?
AnswerATP
Adenosine triphosphate (ATP) releases energy for muscle contraction and other cell work.
Expert level
What are the three types of muscle tissue?
AnswerSkeletal, cardiac and smooth
Skeletal muscle moves bones, cardiac muscle forms the heart and smooth muscle lines organs.
Which muscle is generally considered the largest in the human body?
AnswerGluteus maximus
The gluteus maximus in the buttocks is the body's largest muscle, used in standing up and climbing.
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