2. The Skin: Structure………. a. Epidermis made of epithelial cells b. Dermis with sweat glands hair follicles oil glands capillaries nerve cells

3. The Skin..……….. the largest organ in the body Function: protection temperature control sensory integrity of the body secretions from glands produces Vitamin D

4. Support Systems may be: Exoskeleton:Endoskeleton: Hard outer covering Internal set of bones

5. Human Endoskeleton made of a.Axial: skull, backbone, ribs, sternum b.Appendicular: arms, legs, shoulders, hips,wrists, ankles

6. Endoskeletons also have……. Ligaments that hold bone to bone Tendons that hold muscle to bone, “muscle tenders” Joints where 2 bones come together

7. Cartilage is replaced by bone during the process of bone formation called ossification. Bone tissue forms as osteoblasts secrete mineral deposits. When the osteoblasts become surrounded by bone tissue, they mature into osteocytes.

8. Bone Structure :

9. The Muscular System

10. SKELETAL CARDIACSMOOTH

11. How Do Muscles Contract? Muscle bundles work in opposite pairs: Contracting & Relaxing (biceps & triceps in the arms)

12. Sliding Filament Theory of Muscle Contraction: Let’s Watch 3d view