* Cells are the basic, fundamental unit of life. They are the building blocks of all living organisms.
* Tissues are groups of similar cells that work together to perform a specific function.
Therefore, tissues are NOT found *inside* cells, but rather are made up of many cells.
Inside a cell, you find the following major components:
* Plasma membrane: The outer boundary of the cell, controlling what enters and exits.
* Cytoplasm: The gel-like substance that fills the cell, containing organelles.
* Organelles: Specialized structures within the cell, each with a specific function. Some examples are:
* Nucleus: Contains the cell's genetic material (DNA).
* Ribosomes: Responsible for protein synthesis.
* Mitochondria: Powerhouse of the cell, producing energy (ATP).
* Endoplasmic reticulum: A network of membranes involved in protein and lipid synthesis.
* Golgi apparatus: Modifies and packages proteins and lipids.
* Lysosomes: Break down waste products and cellular debris.
So, to summarize: Cells are the building blocks of tissues, and within a cell, you find various organelles working together to keep the cell functioning.
