5.3_ Physiology of the Muscular System_ Essential Human Anatomy and Physiology I with Lab- Keck.pdf

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8/20/20205.3: Physiology of the Muscular System: Essential Human Anatomy and Physiology I with Lab- Keck2/11found within the heart. Under the microscope, skeletal and cardiac muscle appear tobestriatedor striped in appearance, while smooth muscle is free of striations.Figure 5.34 Histological view of the three different types of muscle tissue:Cardiac (top), skeletal (middle), and smooth (bottom).Figure 5.35 Histology of skeletal muscle tissue.Note the visible striations (striped
8/20/20205.3: Physiology of the Muscular System: Essential Human Anatomy and Physiology I with Lab- Keck3/11appearance).Figure 5.36 Histology of smooth muscle tissue.Note there are not visiblestriations.Skeletal muscles, which make up over 40% of the body's weight, are attached to theskeleton by tendons, made of fibrous connective tissue.Tendonsconnect muscle tobone, whileligamentsconnect bone tissue to bone.When muscles contract, they become shorter. Muscles can only pull; they cannotpush. Skeletal muscles must work in antagonistic pairs because muscles are onlyable to pull in the direction of their fiber orientation. If one muscle of anantagonisticpairbends the joint and brings the limb toward the body (theflexor), the other onestraightens the joint and extends the limb (theextensor), as shown in the figurebelow. The following is a review of action terminology (see Module 1) with examplesof antagonistic pairs found within the muscular system:Action Terms -Body MovementFlexion- closing of a joint,“bending”Extension- opening of a joint,“straightening”
8/20/20205.3: Physiology of the Muscular System: Essential Human Anatomy and Physiology I with Lab- Keck4/11

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