← MuscleChallenge.com

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.

Play today's round

The basics

What connects muscles to bones?

AnswerTendons

Tendons attach muscle to bone; ligaments connect bone to bone.

Where in the body is the biceps muscle?

AnswerUpper arm

The biceps sits at the front of the upper arm and bends the elbow.

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.

Smooth muscle, found in the walls of the stomach and blood vessels, works how?

AnswerInvoluntarily

Smooth muscle works automatically without conscious control.

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.

Know these cold?Today's round is five questions like these, 20 seconds each. Your streak and level follow you to every arena.Play today's round