Here's how it works:
* Cells are the basic building blocks of life.
* Tissues are groups of similar cells that work together to perform a specific function (e.g., muscle tissue, nervous tissue).
* Organs are made up of different types of tissues that work together to carry out a complex function (e.g., the heart, lungs, stomach).
* Organ systems are groups of organs that work together to perform major bodily functions (e.g., the digestive system, the circulatory system).
So, think of it like this: cells are the bricks, tissues are the walls, organs are the rooms, and organ systems are the entire house!
