Presentation on theme: "The Muscular System Chapter 7"— Presentation transcript:
1 The Muscular System Chapter 7 The anatomical system of a species that allows it to move. The muscular system in vertebrates is controlled through the nervous system, although some muscles are (such as the cardiac muscle) can be completely autonomous.
2 Overview of Muscular System Types of Muscle TissueUnder voluntary controlSkeletal musclesUnder involuntary controlCardiac muscleSmooth musclevisceral organs
3 Overview of Muscular System Skeletal muscles attach to bones directly or indirectlyPerform five functionsProduce movement of skeletonMaintain posture and body positionSupport soft tissuesGuard entrances and exitsMaintain body temperature
4 Anatomy of Skeletal Muscles Gross AnatomyConnective tissue organizationEpimysiumFibrous covering of whole musclePerimysiumFibrous covering of fascicleEndomysiumFibrous covering of a single cell (a muscle fiber)Tendons (or aponeurosis)- at each end of the muscle, the collagen fibers of all three layers come together to form either a bundle or a broad sheet.
5 Anatomy of Skeletal Muscles The Organization of a Skeletal MuscleFigure 7-1
7 Anatomy of a Muscle Fiber Microanatomy of a Muscle FiberSarcolemmaPlasma membraneSarcoplasmcytoplasmSarcoplasmic reticulum (SR)Like smooth ERTransverse tubules (T tubules)Myofibrils (contraction organelle)SarcomeresInside a single fiber
8 Anatomy of Skeletal Muscles Sarcomere—Repeating structural unit of the myofibrilComponents of a sarcomereMyofilamentsThin filaments (mostly actin)Thick filaments (mostly myosin)Z lines at each endAnchor for thin filamentsFilament – a chain of cells