ANAT 025 Lecture Notes - Lecture 3: Skeletal Muscle, Cardiac Muscle, Smooth Muscle Tissue
25 May 2020
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Skeletal muscle tissue is packaged into skeletal muscles: organs that are attached to bones and skin. Skeletal muscle fibers are longest of all muscle and have striations (stripes) Also called voluntary muscle: can be consciously controlled. Cardiac muscle tissue is found only in heart. Contracts at steady rate due to heart"s own pacemaker, but nervous system. Smooth muscle tissue: found in walls of hollow organs. Excitability (responsiveness): ability to receive and respond to stimuli. Contractility: ability to shorten forcibly when stimulated. Elasticity: ability to recoil to resting length. Four important functions of muscle: produce movement: responsible for all locomotion and manipulation, example: walking, digesting, pumping blood, maintain posture and body position, stabilize joints, generate heat as they contract. Skeletal muscle is an organ made up of different tissues with three features: nerve and blood supply, connective tissue sheaths, and attachments. Each muscle receives a nerve, artery, and veins. Consciously controlled skeletal muscle has nerves supplying every fiber to control activity.
