Levels of Organization

Vocabulary flashcards covering the six levels of organization in the human body based on lecture notes.

Chemical Level

The first level of organization where atoms and molecules, the smallest building blocks of the body, combine to form larger molecules such as water, glucose, and proteins.

Cellular Level

The second level of organization consisting of cells, which are the basic units of life that have similar structures but different functions.

Tissue Level

The third level of organization where tissues, which are groups of similar cells, work together to perform a specific function.

Organ Level

The fourth level of organization where organs, composed of two or more different types of tissues, work together to perform a specific job.

Organ System Level

The fifth level of organization consisting of groups of organs that work together to carry out major functions in the body.

Organism Level

The final level of organization representing the complete living individual, where all organ systems work together to maintain life.

Cell

The basic unit of life; all cells have similar structures but different functions, such as muscle cells, neurons (nerve cells), and red blood cells.

Tissue

A group of similar cells that work together to perform a specific function, such as nervous tissue, muscle tissue, and connective tissue.

Organ

A structure made of two or more different types of tissues working together to perform a specific job, such as the heart, stomach, lungs, and liver.

Organ System

A group of organs that work together to carry out major functions in the body, such as the cardiovascular, respiratory, digestive, and nervous systems.

Organism

The complete living individual, such as humans, in which all organ systems work together to maintain life.