4Types of MusclesInvoluntary Muscles – Muscles that are not under your conscious control – involved in breathing and digesting foodVoluntary Muscles – Muscles that are under your conscious control – smiling, turning a page, getting out of a chairThree types of muscle tissue:Skeletal, smooth and cardiac
5Skeletal muscleAttaches to and moves bonesLooks striated or banded under a microscopeMove only when you want them to: voluntaryReact quickly and tire quicklyTendon – strong connective tissue that attaches muscle to bone
7Smooth MuscleSmooth – found on the inside of many internal organs – Ex. StomachInvoluntaryHelp to control breathing, blood pressure, and movements of the digestive systemNo striations or bandsReact slowly, tire slowly
8Cardiac Muscle Found only in the heart Some characteristics of both skeletal and smoothInvoluntaryStriatedDoes not tireContracts repeatedlyheart beat
9Muscles at WorkSkeletal muscles only contract when they receive a message from nervous system.Muscles do work only by contracting or shortening.For movements need 2 muscles or groups of muscles (always work in pairs)Ex. Biceps and triceps work together to bend and straighten your arm.
10Muscular Strength and Flexibility Exercise makes individual muscle cells grow in size – that makes the whole muscle thickerThe thicker the muscle the stronger it isStretching makes muscles more flexiblePrepares muscles for exercise or play
11Muscle InjuriesMuscle strain or pulled muscle – when muscles are overworked or overstretchedTendons can also be overstretched or partially tornMuscle cramp – whole muscle contracts strongly and stays contracted