Are you being sarcastic with the "gross"? If so these systems are natural, what pretty much keeps our body working. The human body systems are:
1. Skeletal system 2. Muscular system 3. Digestive system 4. Circulatory system
5. Respiratory system 6. Integumentary (skin) system 7. Nervous system 8. Excretory (urinary) system 9. Reproductive system 10. Endocrine system :-)
Gross means what the eye can see. Thank you for the reply I had those as well but I needed some more opinions cos I'm not very confident at Human Biology. Thanks again.
Oh sorry for the mistake. I misunderstood. Your welcome anyways :)
You're cleverer than me and you're 10 years younger haha :)