Presentation on theme: "Skeletal, Muscular, and Integumentary Systems"— Presentation transcript:
1 Skeletal, Muscular, and Integumentary Systems Ch. 36
2 Skeletal System-The skeletal system has 206 living bones in the average human body. Function: -supports the body -protects internal organs -provides for movement -stores mineral reserves -blood cell production -Bones are made up of the elements phosphorus and calcium.
3 Two Divisions of the Skeletal System: 1. Axial- skull, vertebral column, and rib cage2. Appendicular- bones of the arms, legs, pelvis, and shoulder
4 Bone StructurePeriosteum- outer layer Compact Bone- thick solid layer Haversian Canals- tubes that contain blood vessels and nerves. Spongy Bone- found at the tips of long bones; porous; contains red bone marrow. Bone Marrow- center core of bones; contains yellow bone marrow. Growth Plate- area of dividing bone cells in kids and young adults. Cartilage- connective tissue found at the tips of bones; layer of protection.
5 Bone Development-Human embryos are made of cartilage. -Cartilage hardens to bone as the ‘birth’ date gets closer. Process is ossification. -Some areas of cartilage stay intact throughout the life of a human.
6 Types of Bone Cells:Osteocytes- mature bone cells. Osteoclasts- break down old bone cells. Osteoblasts- produce new bone cells. *Your body continually breaks down old bone cells and replaces them with new bone cells.
7 Types of Joints:Joint- a place where one bone attaches to another bone.Types: 1. Immovable (suture, bones in the skull)2. Slightly Movable (symphysis, bones of the vertebrae)3. Freely Movable (ball-and-socket, hinge, pivot, saddle)Joints are held together by ligaments.
8 Skeletal System Disorders: Inflammation of a Joint Arthritis Osteoporosis
9 Ch Muscular SystemFunction: movement throughout the body. Types: 1. Skeletal- moves the bones; voluntary. 2. Smooth- lines internal organs structures in the body; involuntary. Examples: lining of the stomach 3. Cardiac- found in the heart; involuntary. Allows for contraction of the heart.
10 Muscle ContractionMuscle Fibers (cells) Myofibrils Filaments Actin & Myosin Actin and Myosin are proteins that are the basis for all muscle contraction. Muscle contraction occurs when ATP (energy) causes the actin to slide over the myosin. Muscle Contraction Clip
16 Epidermis -outer most layer of the epidermis is made up of dead skin cells. -inner layer of the epidermis is made up of living cells. -contains the protein, keratin. Gives skin its waterproof ability. -contains the protein, melanin. Gives skin its color and protects from UV light.
17 Dermis -inner (middle) layer of the skin Dermis -inner (middle) layer of the skin. -contains collagen, blood vessels, nerves, glands, muscles, and hair follicles. -Two major glands: 1. sweat- helps cool the body 2. sebaceous (oil)- secrete sebum
18 Hypodermis -contains adipose (fat) -functions to insulate and store nutrients
19 Hair -made up of keratin -protects the body and internal structures -made in hair follicles -oil glands secrete oil to protect the hair Nails -nails grow from the nail root -protects the tips of fingers and toes
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