Seeley's Anatomy and Physiology Chapter 9 and 10 Exam (4) Q&A 2023 Update

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3 types of muscle tissue - ANS-skeletal, cardiac, smooth; Skeletal muscle is responsible for most body movements; smooth muscle is found in the walls of hollow organs and tubes and moves substance... s through them; and cardiac muscle is in the heart and pumps blood. What are the General Properties of Muscle Tissue - ANS-1.Muscle exhibits contractility (shortens forcefully), excitability (responds to stimuli), extensibility (can be stretched and still contract), and elas-ticity (recoils to resting length). 2.Muscle tissue shortens forcefully but lengthens passively What is Whole Skeletal Muscle Anatomy - ANS-1.Muscle fascicles, bundles of muscle fibers, are covered by the connective tissue layer called the perimysium. 2.The entire muscle is surrounded by a connective tissue layer called the epimysium. 3.Motor neurons extend together with arteries and veins through the connective tissue of skeletal muscles. 4.At the level of the perimysium, axons of motor neurons branch, and each branch projects to a muscle fiber to form a neuromuscular junction. Perimysium - ANS-Connective tissue surrounding a fascicle Fascicle - ANS-bundle of muscle fibers epimysium, perimysium, endomysium - ANS-3 layers of connective tissue (Muscle layers) Epimysium - ANS-surrounds entire muscle Endomysium - ANS-Connective tissue surrounding a muscle fiber What is Skeletal Muscle Fiber Anatomy - ANS-"1.A muscle fiber is a single cell consisting of a plasma membrane (sar-colemma), cytoplasm (sarcoplasm), several nuclei, and myofibrils. 2.Myofibrils are composed of two major protein fibers: actin and myosin. ■Actin myofilaments consist of a double helix of F actin (composed of G actin monomers), tropomyosin, and troponin. ■Myosin molecules, consisting of two globular heads and a rodlike portion, constitute myosin myofilaments. ■A cross-bridge forms when the myosin binds to the actin. 3.Actin and myosin are organized to form sarcomeres. ■Sarcomeres are bound by Z disks that hold actin myofilaments. Continues... [Show More]

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