28.1 Levels of Organization KEY CONCEPT The human body has five levels of organization.

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28.1 Levels of Organization KEY CONCEPT The human body has five levels of organization.

28.1 Levels of Organization Specialized cells develop from a single zygote. Organisms are made up of specialized cells. red blood cellnerve cell

28.1 Levels of Organization 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

28.1 Levels of Organization cell 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. tissue –epithelial tissue –connective tissue –muscle tissue –nervous tissue

28.1 Levels of Organization 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

28.1 Levels of Organization There are 11 major organ systems in the human body. Pumping blood Food processing Hormone/weight control/ water levels garbage Skin & what comes out of it Movement/involuntary/heart Sensory & motor Breathing Bone-bone / bone-muscle