Levels of Organization

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How is the human body organized?

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Levels of Organization Least Complex Cell Tissue Organ System Organism Most Complex

Cells The basic unit of structure and function. Necessary for life and have specialized functions Examples: Nerve cells, blood cells, bone cells, skin cells, muscle cells etc.

Specialized cells that work together to perform the same function. Tissues Specialized cells that work together to perform the same function. Nerve tissue—carries impulses back and forth to the brain from the body Muscle tissue (cardiac, smooth, skeletal)—contracts and shortens, making body parts move Epithelial tissue—covers the surfaces of the body, inside (as lining and/or covering of internal organs) and outside (as layer of skin) Connective tissue—connects all parts of the body and provides support (for example tendons, ligaments, cartilage)

· The task is generally more complex than that of the tissue. Organs A group of two or more different types of tissue that work together to perform a specific function. · The task is generally more complex than that of the tissue. · For example, the heart is made of muscle and connective tissues which function to pump blood throughout the body.

Systems A group of two or more organs that work together to perform a specific function. · Each organ system has its own function but the systems work together and depend on one another. · There are eleven different organ systems in the human body: circulatory, digestive, endocrine, excretory (urinary), immune, integumentary (skin), muscular, nervous, reproductive, respiratory, and skeletal.