CKLA Human Body Pausing Point 2

I can become larger and smaller, depending on the amount of light. What am I?

I'm the system that makes your bones move. I also help you blink and smile. What system am I?

I'm the largest part of your brain. I control language, memory, decision making,.... What am I?

3 inches long & thick as my thumb, I relay messages between the brain & spinal cord. What am I?

We're the 3 smallest bones in the human body and are located in the middle ear. What are we?

I am a small tunnel in your ear. You can find wax inside of me. What am I?

I am rubbery, flexible, transparent, and change shape to focus on near/far objects. What am I?

Without me you can't feel, see, or hear. My main organ is the brain. Which body system am I?

I am strong, give your body its shape, and protect organs. Which body system am I?