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Unit 19: Biology Part 2                                                    Page 20 of 137


                                                Objectives




                             Lesson 1: Skin, Bones & Muscles


               We will go over integumentary,                     The bones work in concert with the

               skeletal, and muscular systems by                  muscles to give us the ability to
               beginning with a general overview                  move. Certain parts of certain
               of the body.                                       types of bones make blood cells.
                                                                  Bones store calcium and
               The first section describes how the                phosphorus (mostly calcium).
               organization of the body helps
               maintain the normal state called                   It’s always good to have a strong
               homeostasis. The body is made up                   finish—so we end with muscles!
               of millions of cells, which are                    How do they do what they do?
               organized into tissues. Two or                     What are they made of? What
               more tissues helping perform the                   would an absurdly muscular man
               same function is called an organ.                  look like? All of these questions
                                                                  and more are answered in this
               The second section deals with our                  section.
               largest organ (our skin) as well as
               our hair and nails. These three                    By the end you will have a whole

               together are called the                            new vocabulary and a whole new—
               integumentary system. We’ll soon                   and detailed—way to look at the
               discover the main functions of our                 human body.
               skin, hair, and nails, as well as
               what they are made out of.


               Bones are made up of several
               parts; bone marrow (red and
               yellow), spongy bone, compact
               bone, and the periosteum.


               Bones give the body its structure—
               its shape. It holds up the tissue
               against the pressure of gravity.
               Bones also protect certain tissues.







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