Human Body Systems

What is inside our bones and has blood cells?

Which one is NOT an organ our rib cage protects?

How many bones do adults have?

What is the purpose of skin?

What system is formed from tissue?

What is the longest and strongest bone in our body?

Which one is NOT a function of our skeletal system?

What does our skull protect?

What are attached to bones, helps movement and relaxes the body?

What does our spine protect?

What is the largest organ in the body?

Which is NOT helped by the muscular system?

What keeps bones from rubbing together?