Cell, Tissue, Organ || Level of Organization || Biology Basics #biology #biologynotes

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Explanation:

Cells
1. *Basic building blocks of life*: Cells are the smallest units of life that can replicate independently.
2. *Structural and functional units*: Cells perform various functions necessary for life, such as metabolism, growth, and reproduction.
3. *Variety of cell types*: There are many types of cells, including nerve cells, muscle cells, blood cells, and more.

Tissues
1. *Groups of similar cells*: Tissues are formed when multiple cells of the same type work together to perform a specific function.
2. *Four primary tissue types*: There are four main types of tissues:
1. *Epithelial tissue*: Forms the lining of organs and glands (e.g., skin, lung lining).
2. *Connective tissue*: Supports and connects other tissues and organs (e.g., bone, cartilage).
3. *Muscle tissue*: Allows for movement and contraction (e.g., skeletal muscle, smooth muscle).
4. *Nervous tissue*: Transmits and processes information (e.g., brain, spinal cord).
3. *Tissues work together*: Tissues often work together to form organs.

Organs
1. *Structures composed of multiple tissues*: Organs are formed when two or more types of tissues work together to perform a specific function.
2. *Examples of organs*: Organs include the heart, lungs, liver, kidneys, and brain.
3. *Organs work together*: Organs often work together to form systems.

Systems
1. *Groups of organs working together*: Systems are formed when multiple organs work together to perform a specific function.
2. *Examples of systems*: Systems include the circulatory system, respiratory system, digestive system, and nervous system.

This hierarchy is essential for understanding how living organisms function:

Cells → Tissues → Organs → Systems → Organism

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