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CHAPTER 9 (1): MUSCLES ANDMUSCLE TISSUEHuman Anatomy and Physiology I –BIOL152Overview and Introduction to SkeletalMuscle
Objectives/GoalsDescribe functions and characteristics of themuscular systemCompare the 3 types of muscle found in thebodyIdentify the macroscopic and microscopicstructures of skeletal muscleDescribe the steps and requirements of thesliding filament theoryand cross bridge cycle ofmuscle contraction
Functions of the Muscular SystemTheMuscularSystemTheMuscularSystemStabilizeJointsStabilizeJointsMaintainPostureMaintainPostureSupport/ProtectOrgansSupport/ProtectOrgansRegulateOpeningsRegulateOpeningsMovementMovementGenerate HeatGenerate Heat
Characteristics of MuscleContractilitythe ability to shorten forciblyElasticitythe ability to recoil and resume restinglength after shorteningExcitabilitythe ability to respond to a stimulusExtensibilitythe ability to stretch
Types of MuscleLocationStructureControlVoluntaryInvoluntaryInvoluntarySkeletalCardiacSmooth
QuestionWhich of the following is a recognizedfunction of skeletal muscle?
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Objectives/GoalsDescribe developmental aspects, functions, andcharacteristics of the muscular systemCompare the 3 types of muscle found in thebodyIdentify the macroscopic and microscopicstructures of skeletal muscleDescribe the steps and requirements of thesliding filament theory and cross bridge cycle ofmuscle contraction
Skeletal Muscle -CharacteristicsEach muscle served by one artery, onenerve, and one or more veinsEach artery, nerve, and vein enters or exitsnear the central part of the muscle andbranch through connective tissue sheathsEvery skeletal muscle fiber supplied bynerve ending that controls its activity –more to come in the next lectureLarge amounts of nutrients and oxygen isneeded for muscle contraction
Skeletal Muscle - Characteristics (cont.)Connective tissue encases skeletalmuscle and componentsFunction is to support cells and reinforcewhole muscle