The heart is made mainly of which type of muscle?
AnswerCardiac muscle
Cardiac muscle is found only in the heart and contracts rhythmically.
Fitness · Facts & stats
Muscle facts & stats
7 fact-checked facts about muscles, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is the largest muscle in the human body?
AnswerGluteus maximus
The gluteus maximus in the buttock is the body's largest muscle.
Going deeper
How many heads does the quadriceps muscle group have?
Answer4
Quad means four: the quadriceps are four muscles at the front of the thigh.
Which muscle is the main muscle used for breathing?
AnswerDiaphragm
The dome-shaped diaphragm contracts to draw air into the lungs.
Which tendon at the back of the ankle is the largest and strongest in the body?
AnswerAchilles tendon
The Achilles tendon joins the calf muscles to the heel bone.
Expert level
What is the smallest skeletal muscle in the human body?
AnswerStapedius
The stapedius, in the middle ear, steadies the tiny stapes bone.
Roughly how many skeletal muscles does the human body have?
AnswerMore than 600
Counts vary by method but exceed 600; 206 is the number of bones in an adult.
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