Bill Nye: bones & muscles

What helps hold bones together in the human body?

• Tendons

• Cartilage

• Ligaments

• Muscles

Which type of joint allows the thumb to move in two directions?

• Sliding joint

• Fixed joint

• Ball-and-socket joint

• Saddle joint

What is the strongest bone in the human skeleton?

• Teeth

• Spine

• Femur

• Ribs

What is the role of calcium in bones?

• It strengthens bones

• It prevents bones from breaking

• It helps bones grow longer

• It makes bones flexible

How many bones does a human skeleton have at birth?

• 150

• 600

• 350

• 200