Presentation on theme: "Skeletal System, Muscular System, & The Skin. We are born with over 300 bones. As we grow, some of these bones fuse together. As adults we have only 206."— Presentation transcript:
Skeletal System, Muscular System, & The Skin
We are born with over 300 bones. As we grow, some of these bones fuse together. As adults we have only 206 bones !
Bone Facts: Function - Your bones manufacture red blood cells and store useful minerals. Bones are held together by muscles that allow them to move. Some bones are joined by flexible parts called joints. Ligaments – connective tissue which holds bone in moveable joints. (A sprain is when ligaments are stretched too far.) The smallest bones are in your ear. The largest bone, the femur, is found in your thigh.
The bones in your body are very much alive. Each is a living organ made of several different tissues. Like all the other living tissues in your body, bone tissue is made of cells that take in nutrients and use energy. Bone cells have the same needs as other body cells. Living Bones
Functions of Your Skeletal System 1.The skeleton gives shape and support to your body. 2.Bones protect your internal organs.
3.Major muscles are attached to bone and help them move. 4.Blood cells are made in the bone marrow. Functions of Your Skeletal System 5.Calcium and phosphorous are stored in the skeleton for later use.
Jaw Bone Tail Bone
Skull – protects the brain.
Bones have bumps, edges, round ends, rough spots, and many pits and holes. Muscles and ligaments attach to some of the bumps and pits. Bone Structure In your body, blood vessels and nerves enter and leave through the holes.
Define: Joint Cartilage Ligament
Joint - Anyplace where two or more bones come together. Cartilage - Slick, smooth, slippery, flexible tissue that makes movement easier. Ligaments - A tough band of tissue that is attached to bones.
Cartilage – a connective tissue that is more flexible than bone. It reduces friction that would be caused by bones rubbing together.
Joints are broadly classified as immovable or movable. Immovable Joints An immovable joint allows little or no movement. Ex. skull and pelvis
Movable Joints – Describe each: Pivot Joint Ball and Socket Joint Hinge Joint Gliding Joint
pivot joint - one bone rotates in a ring of another bone that doesn’t move. Movable Joints Ex. Forearm
ball-and-socket joint consists of a round bone fitting into a cup-like bone. Movable Joints Ex. Shoulder & Hip
hinge joint-back-and-forth movement like hinges on a door. Movable Joints Ex. Knee, elbows, toes, & fingers
gliding joint - a bone slides over another bone in a back-and-forth motion. Ex. Wrists, ankles, and between vertebrae Movable Joints
Your rib cage is made up of 12 vertebrae, 24 ribs and a breastbone in three parts. It protects your heart and lungs from knocks and bumps.rib cagelungs
Look, Mom, no hands....no feet!! Over half your bones are found in your hands and feet. There are 26 bones in each foot and 27 in each hand.
Osteoporosis Osteoporosis – mineral loss in bones where they become weak and break easily.
Scoliosis Interactive - Possible causes: congenital spine deformities, genetic conditions, neuromuscular problems, etc. -Over 80% of scoliosis cases, have no known cause and are found in otherwise healthy people.
MRI’s soft tissue X Rays bone tissue
“I’m just “bigged boned”.” (??)
Movable Joints – Pivot Joint - Forearm Ball and Socket Joint – Hip / Shoulder Hinge Joint – Fingers, elbow, knees and toes Gliding Joint – Neck vertebra & down spine, wrist, ankle
Human Skeleton 9
Muscles & the Facts Goose Bumps – caused by smooth muscles, the tiniest muscles. 100 muscles in your face 17 muscles used to smile 43 muscles to frown!!!!!
Movement of the Human Body Muscle - an organ that can relax, contract, and provide the force to move your body parts. What is the difference between voluntary and involuntary muscles?
Involuntary Muscles – muscles you can’t control consciously. work all day long Ex: circulatory and digestive muscles.
Voluntary muscles - Muscles that you are able to control.
Parts of the Muscular System Smooth Muscles Cardiac Muscles Skeletal Muscles Tendons Define each part of the Muscular System.
Cardiac muscles Involuntary muscle that controls the heart. Skeletal muscles –Voluntary muscles that make us move –THEY WORK IN PAIRS. Muscles always pull. They never push. Smooth muscles Involuntary muscles in organs and body systems. Types of Muscles:
the muscles that move bones muscles that work in pairs Skeletal Muscles Tendons - Tissues that attach muscle to bones to enable movement. Walking bobby pin
Cardiac Muscle Cardiac muscle - found only in the heart. This type of muscle contracts about 70 times per minute every day of your life.
Smooth Muscles Smooth muscles - found in your organs. involuntary muscles that slowly contract and relax. Internal organs are made of one or more layers of smooth muscle.
Pushing the Limits 43
What is Skin???
Epidermis – Upper layer of thin skin where skin cells die and flake off. Dermis – Layer of cells below the epidermis where blood vessel and nerve endings are located.
Your Largest Organ Your skin is the largest organ of your body. Much of the information you receive about your environment comes through your skin. You can think of your skin as your largest sense organ. List the 6 functions of the Integumentary / Skin System.
Functions of Integumentary / Skin System Covers body and prevents water loss. Protects body from infection or injury. Regulates body temperature. Eliminates waste - salt and excess water. Gathers information from environment (Touch, etc.) Produces Vit. D to help digestive
Melanin Cells in the epidermis produce the chemical melanin. Melanin is a pigment that protects your skin and gives it color. The different amounts of melanin produced by cells causes differences in skin color.
Melanin When your skin is exposed to ultraviolet rays, melanin production increases and your skin becomes darker. Lighter skin tones have less protection from the Sun Such skin burns more easily and may be more susceptible to skin cancer.
Skin Cancer Damaged skin cells begin to grow and divide uncontrollably.