Presentation on theme: "Function: Provides shape and support Allows movement Protects tissues and organs Stores certain minerals Produces blood cells."— Presentation transcript:
Function: Provides shape and support Allows movement Protects tissues and organs Stores certain minerals Produces blood cells
Bones- A solid network of living cells and protein fibers that are surrounded by deposits of calcium. Structures of a bone: Periosteum- The tough layer outer layer of the bone. Compact Bone- contains Haversian canals that contain blood vessels and nerves Spongy Bone- found in the ends of bones and produces RBC. Yellow bone Marrow- made of fat cells. Red Marrow- Produces RBC, WBC, and platelets.
Cartilage- Strong, connective tissue that supports the body. Softer and more flexible than bone *There are approximately 206 bones in the human body.*
Cartilage is gradually replaced by bone during a process called ossification. Osteoblasts secrete mineral deposits that replace cartilage in developing bones. Osteocytes help maintain the minerals in bone tissue and continue to strengthen the growing bone.
Ligaments- Hold bone to bone. Example: Hold bones together in knee; ACL. Tendons- Hold muscle to the bones. Example: Achilles tendon attaches to the calf.
Joint- is any place where two bones come together. -Types of Joints: ① Movable- prevent movement in one or more directions. Examples: pivot joint (radius and ulna); ball and socket (arm into shoulder) ② Semi-movable- allow a little bit of restricted movement. Example: Vertebrae. ③ Immovable- allow no movement at all. Example: Skull
Arthritis: Inflammation of joints Osteoporosis: loss of calcium in bones leading to weakening of bones
Function: Communication of pain, pressure, temperature Protection of body: Prevents dehydration Regulates body temperature Barrier for disease/infection Covers and holds in organs Removes waste products Barrier for sun’s UV rays
Epidermis: Outermost layer - Two layers: -Inner layer: living cells -Outer layer: dead cells - Contains : -Keratin- waterproofing -Melanocytes- produces pigment
Hair- made of dead epidermal cells. Function: protect skin from UV rays (on head); provide insulation from cold; hairs in nose, ears, eyelashes prevent dirt and other particles from entering body. Nails- Sheets of keratinized cells Function: protects tips of fingers/toes