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6/9 & 6/10 - 7th Grade Agenda Learning Objective: Drug Abuse Prevention Drug Abuse Prevention Lesson Video: Walking with Prehistoric Beasts Reflection • Prompt: Write 2 things that you enjoyed about this class and 2 things that should be improved about this class. What is the function of the skeletal system? • Provide shape and support • Enables the body to move • Protects the internal organs • Produces blood cells • Stores certain material until the body needs them Hinge Joint • Knee and Elbow are hinge joint • Hinge joint allows you to bend and straighten your leg Ball and Socket Joint • Your shoulder contains ball and socket joint. • Allows great range of motion Pivot Joint • Pivot joint allows one bone to rotate • Your neck is made of a pivot joint. Sliding Joint • Sliding joint allows one bone to slide over another • Wrist or ankle are examples of sliding joint What are Ligaments? • Bones are held together by strong connective tissues called ligaments What is a cartilage? • Cartilage covers the ends of the bones and keep them from rubbing against each other Structure of Bone What is bone marrow • Red bone marrow produces most of the body’s blood cells • Yellow bone marry stores fat that can serve as energy reserve Osteoporosis • As people become older, their bones begin to lose some of the minerals they contain. • Mineral loss can lead to osteoporosis a condition in which the body’s bones become weak and break easily Different Types of Muscles • skeletal muscle: are attached to the bones of your skeleton. • smooth muscle are involuntary muscles used to aid digestion • cardiac muscle: cardiac muscle does not get tired. It can contract repeatedly. How Muscles Work What are levers • Levers allow you to move heavy objects with little effort Our body is full of levers