Anatomy
These tough, stretchy bands of tissue connect your muscles to your bones.
What Are Tendons
Muscles can only do this action to bones; they can never push them.
What is pull
This type of muscle is attached to your bones and allows you to kick a soccer ball or write with a pencil.
What is skeletal muscle
It takes more muscles to do this sad facial expression than it does to smile.
What is a frown
Muscles need plenty of this liquid to prevent painful muscle cramps, especially on hot days.
What is water
This is the scientific name for the large "belly muscle" on the front of your upper arm that bulges when you bend your elbow.
What is the biceps
Because muscles can only pull, they must work in these pairs to move a joint back and forth.
What are opposing pairs (or complementary pairs)
This special type of involuntary muscle is found only in your heart.
What is cardiac muscle
When you get cold, your muscles rapidly contract and relax to create heat, causing your body to do this.
What is shiver
This macronutrient, found in foods like chicken, beans, and eggs, is essential for building and repairing muscle tissue.
What is protein
This is the total approximate number of muscles in the human body: 300, 650, or 2,000?
What is 650
When a muscle gets shorter and tighter to move a bone, it is doing this action.
What is contracting
This type of muscle is found inside your stomach and intestines to help digest food.
What is smooth muscle
This is the busiest and hardest-working muscle in the body, beating about 100,000 times a day.
What is the heart
You should always do this slow, reaching activity before a workout to prevent pulling or straining a muscle.
What is stretching
While your biceps is on the front of your arm, this muscle is located on the back of your upper arm.
What is the triceps
When your biceps contracts to bend your arm, your triceps does this action.
What is relaxing
Skeletal muscles are called this because you can consciously choose to control and move them.
What is voluntary
Even when you are sitting perfectly still, your muscles are working to maintain this so you don't slump over.
What is posture
This type of painful injury occurs when a muscle is overstretched or torn from working too hard.
What is a strain (or pulled muscle)
This is the largest muscle in the human body, located in your buttocks, which helps you walk, run, and climb stairs.
What is the gluteus maximus
This type of movement happens automatically without you thinking about it, like your eye blinking or your heart beating.
What is involuntary movement
Under a microscope, skeletal and cardiac muscles look like they have stripes or bands. Scientists use this 7-letter word to describe them.
What is striated
This wide, sheet-like muscle below your lungs contracts and flattens out to help you breathe in.
What is the diaphragm
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