Levels of Organization

These flashcards cover the levels of organization within biological systems, basic definitions of cells, tissues, organs, organ systems, and the cell theory.

Levels of Organization

The hierarchical structure in biological organisms from smallest to largest.

Cell

The most basic unit of structure and function of all living things.

Tissue

Groups of similar cells performing the same function.

Organ

A group of tissues that work together to perform a specific function.

Organ Systems

A group of organs that work together to perform a specific function.

Organism

A living individual that can reproduce, grow, and maintain homeostasis.

Cell Theory

A scientific theory that describes the fundamental properties of cells.

Matthias Schleiden

A scientist credited with the development of part of cell theory.

Theodor Schwann

A scientist who contributed to the formulation of cell theory.

Rudolf Virchow

A scientist who proposed that all cells come from pre-existing cells.

Vital Organs

Essential organs for survival, such as the brain, heart, kidneys, and lungs.

Homeostasis

The ability of a living organism to maintain stable internal conditions.

Species

A group of organisms that can interbreed and produce fertile offspring.