Theory:

Have you ever wondered that how our body can perform various actions and functions?

It is due to the presence of the different organ systems that function in a coordinated manner.
Organ system:
An organ system is made up of all the organs that are made up of tissues. Each organ system is concerned with a certain function.
 
Due to this organisation, the human body can perform various activities more efficiently.
A group of organs that work together to perform a specific function is known as an organ system.
The human body comprises of eight major organ systems as follows:
  • Skeletal system
  • Muscular system
  • Digestive system
  • Respiratory system
  • Circulatory system
  • Nervous system
  • Endocrine system
  • Excretory system
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Reference:
https://www.vecteezy.com/vector-art/434408-different-systems-of-human-body-diagram