Levels of Organization in Organisms

Vocabulary flashcards covering the hierarchy of biological organization from cells to organisms, including specific examples and the benefits of division of tasks.

Cell

The smallest living unit and the starting level of hierarchical organization in a multicellular organism.

Tissue

Similar types of cells that group together to perform the same function, such as muscle cells forming muscular tissue.

Organ

A structure formed by different tissues combining to work together, such as the stomach or the heart.

Organ system

A group of organs that perform a specific function and work together, such as the digestive system or the circulatory system.

Organism

The highest level of organization made up of all the organ systems working together.

Epithelial tissue

A protective tissue made up of different epithelial cells.

Lung

An organ made up of different tissues including epithelial tissue, muscular tissue, and nervous tissue.

Respiratory system

An organ system made up of organs such as the lungs, trachea, bronchi, and alveoli.

Division of tasks

A benefit of organization in multicellular organisms that ensures different life processes like reproduction and digestion are distinguished from each other.

Efficiency

Increased in multicellular organisms by the organization of cells into different levels, allowing the organism to perform complex tasks.

Paramecium

A unicellular organism where a single cell performs all life processes such as respiration, digestion, and reproduction.