Presentation on theme: "Musculoskeletal system"— Presentation transcript:
1 Musculoskeletal system Concepts to MasterBones – Joints - Muscles
2 BonesDefinition:A Bone is a hard solid organ that forms part of the skeleton.Fact: 206 Bones divided into 3 regions.Head Trunk LimbsTypes of Bone: spongy and compact
3 Bones Categories of Bones Long Bones: longer than wide thin body (diaphysis) rounded ends (epiphysis)Short Bones: cubic in shape, mostly spongy bone – wrists and anklesFlat Bones: Thin flat and curved – a sandwich of spongy and compact bone. – skull, ribs scapulaIrregular Bones: not covered by the other categories because of their irregular shape – spine
5 Bones Function of Bones Support: Keeps us vertical: supports soft organs (heart, lungs, liver, intestines)Protection: Organ protection – brain, heart, lungsMovement: bones act as levers during muscle movement.Storage: fat storage – mineral storage – calcium, phosphorusProduction of Blood Cells: in the bone marrow – red blood cells, white blood cells, platelets.
6 Joints Mobility of Joints Mechanics of a Joint Fixed: skull, hipSemi movable: vertebraeFreely Movable: shoulderA junction between two or more bonesMechanics of a JointExtension/FlexionAbduction / AdductionRotation
7 MusclesMuscles have the ability to contract causing our bodies OR our internal organs to move.Muscle Functions:MovementPosture MaintenanceJoint StabilizationHeat Release
8 MusclesThree distinct types of muscles carry out the functions described on the previous slide.Muscle Types:Smooth MusclesCardiac MuscleSkeletal Muscle
9 Muscle Properties: Skeletal Muscles: Voluntary muscles that are attached to the skeleton.Can react with great force for short periods of time.Composed of bundled muscle fibers.Muscle is fibers and bundles are covered with connective tissue.Connective tissue fuses at the ends of muscles for form tendons.Tendons attach bone to muscle.Smooth Muscles:Involuntary muscles that make up the wall of internal organs.The help move substances from place to place.Work slower than skeletal and tire less easily.Cardiac Muscle:A unique muscle that makes up the heart.Involuntary muscle like smooth muscle.Structure similar to skeletal muscle.Great strength and endurance.Contraction causes blood to flow throughout the body.