2. Metric Practice-Lab Grade 3. Handout on body systems Day 4, Jan. 18 1.Please put your signed forms on your desk (Letter, discipline form, and lab safety agreement form) Check to see if it is signed in all three places. 2. Metric Practice-Lab Grade 3. Handout on body systems Fri. Test- Ch. 28

KEY CONCEPT The human body has five levels of organization.

Steps in Cellular Organization 1. STEM CELLS can become any of 200 types of specialized cells in the human body. red blood cell nerve cell

Stem cells develop in two stages: 2.Determination-committing to become one cell type 3. Muscle 4.Differentiation-acquiring specialized structures and functions 5.cardia, smooth,skeletal

6.Specialized cells –the smallest form of life Specialized cells function together in tissues, organs, organ systems, and the whole organism. 6.Specialized cells –the smallest form of life 7.Tissues are groups of similar cells working together to perform a specific task. Examples: cell tissue epithelial tissue connective tissue muscle tissue nervous tissue

8.Organs are different tissues that function together. 9.Organ systems are two or more organs working together. 10.Organism collection of organ systems working together. ORGANS ORGAN SYSTEM ORGANISM

There are 11 major organ systems in the human body.