Organization in the human body | Cells and organisms | Middle school biology | Khan Academy

In multicellular organisms, the body is a system of multiple interacting subsystems. These subsystems are groups of cells that work together to form tissues and organs that are specialized for particular body functions.

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Credits:
Respiratory system model made with Biorender.com:
https://biorender.com/

"Epithelial Tissues Stratified Squamous Epithelium" by Berkshire Community College Bioscience Image Library [Public domain], via Wikimedia commons:
https://commons.wikimedia.org/wiki/Fi...

"Russian nesting dolls" by Bill Damon, licensed under a Creative Commons Attribution License (CC BY 2.0):
https://www.flickr.com/photos/5732582...
https://creativecommons.org/licenses/...