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Lab 4 Muscle and Circulatory System Final.pdf - Histology...

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1Histology 3040H: Laboratory 4Muscle and Circulatory SystemIntroduction:In this lab you will explore another of the 4 basic tissue types that compose our entirebodies, muscle, as well as the circulatory system.MUSCLE TISSUE(Text reference Chapter 11)Learning objectives:1.To examine the three types of muscle tissue.2.To become familiar enough with their appearance so you can readily identify each type.Introduction:Each type of muscle has a set of characteristics by which it may be identified. Each ofthese physical characteristics is associated with functional adaptation. The three types of muscle are:1.Skeletal: you will also see the term striated or voluntary (you should avoid using striatedsince cardiac muscle also is a striated muscle).2.Cardiac: the muscle of the heart.3.Smooth: you will also see the term visceral, but the term smooth better reflects all smoothmuscle and you should use this when identifying or describing this type of muscle.The common role of each of these muscle types is contraction, but the manner in which they contractand the control over the contractions differs in each type.I. Skeletal Muscle:This muscle type exhibits a precise, synchronous, repeating banding pattern that is dependent on theorientation of the myofibrils of actin and myosin within the muscle fibres and bundles. Each musclecell (fiber) is a multinucleated syncytium.Skeletal muscle may be easily differentiated from cardiac muscle, even though they are both striated.Some characteristics just exhibited by skeletal muscle include:1.Peripheral disposition of the nuclei2.Each unit is multinucleate3.Fibers exhibit strict parallel orientationContraction of skeletal muscle may be under voluntary, involuntary, or a mixture of voluntary andinvoluntary control. The large muscles associated with movement of the limbs are normally undervoluntary control. However, there are times when the action of these muscles is involuntary, as whenthey are controlled by reflexive action (the reflex arc). For example, if you touch something very hot,the hand is pulled quickly and automatically away from the danger. This reflexive reaction can bemodified to some extent if there is prior awareness of the type of hazard that is to be encountered.There are other skeletal muscles that are normally under involuntary control, such as those controlling
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Term
Fall
Professor
LeslieKerr
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