KEY CONCEPT The human body has five levels of organization.

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Presentation transcript:

KEY CONCEPT The human body has five levels of organization.

Specialized cells develop from a single zygote. Organisms are made up of specialized cells. red blood cell nerve cell

Zygotes first divide into embryonic stem cells. Stem cells develop in two stages. determination, or committing to become one cell type differentiation, or acquiring specialized structures and functions

Specialized cells perform specific tasks. Specialized cells function together in tissues, organs, organ systems, and the whole organism. Specialized cells perform specific tasks. Tissues are groups of similar cells working together. epithelial tissue connective tissue muscle tissue nervous tissue cell tissue

Cells are the basic unit of structure and function in living things. Tissues are a group of similar cells that work together to perform a specific function. Organs are different tissues working together. Organ systems are two or more organs working together. Organism is all organ systems working together. ORGANS ORGAN SYSTEM ORGANISM

There are 11 major organ systems in the human body.

Ted Ed Video http://ed.ted.com/lessons/making-sense-of-how-life-fits-together-bobbi-seleski

STOP & REVIEW Specialized cells develop from a single _______. zygote Zygotes first divide into embryonic ____________. Stem cells Stem cells develop in two stages. ___________, or committing to become one cell type determination ____________, or acquiring specialized structures and functions. differentiation The five levels of biological organization are (in order) Cells Tissue Organ Organ System Organism