Anatomy crossword (easy)

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Across
  1. 3. I'm a twisted maze, digesting food with might. Acidic and potent, I work through the night. What am I?
  2. 5. I'm a master regulator, overseeing the body's metabolism. Without me, there'd be a cataclysm. What am I?
  3. 8. I'm the site of oxygen exchange, lined with delicate sacs where air meets blood. What am I?
  4. 10. I'm a gatekeeper of nutrients, absorbing in the intestines so finely. Without me, digestion would decline. What am I?
  5. 11. I'm a messenger of pain, transmitting signals with speed. When you stub your toe, it's me you'll heed. What am I?
  6. 12. I'm a small bone located in the knee joint and I'm often called the "kneecap." What am I?
  7. 14. I'm the silent guardian of your skeleton, protecting your delicate brain. What am I?
  8. 15. I'm a muscle located in the upper arm, responsible for flexing the forearm. What am I?
  9. 18. I'm the protector of the lungs, a cage of bones strong and true. Without me, breathing would be askew. What am I?
  10. 19. I'm the body's flexible band, connecting muscles to bones. What am I?
  11. 20. I am the largest part of the brain, divided into two hemispheres. I am sometimes called "the thinking brain." What am I?
Down
  1. 1. I'm a regulator of rhythm, pacing the heart's beat. Without me, life would retreat. What am I?
  2. 2. i am a strong elastic tissue. I can be found in places like the top of your nose and the top of your ear. What am i?
  3. 4. I'm a membrane that lines the inner surface of the lungs and chest cavity, facilitating breathing. What am I?
  4. 6. Objects appear upside down on me. I live at the back of your eyeball. What am I?
  5. 7. Originally used to refer to the “spoke of a wheel”, name this bone that not only resembles one, but also works as a mathematical term for half of the length separating to largest parts of a circle.
  6. 9. I regulate light, adjusting to let more or less through. Without me, vision would skew, your eyes would lose its hue. What am I?
  7. 13. I'm a bone in the human leg, also known as the shinbone. What am I?
  8. 16. I'm a spongy organ, filtering blood with might. Without me, toxins would incite. What am I?
  9. 17. I am called a bone, but I am really a nerve. My name suggests that I have a sense of humor. What am I?