BLG 601 Lecture Notes - Lecture 3: Autonomic Nervous System, Skeletal Muscle, Epimysium

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Locomotion, facial expressions, posture, respiratory movements, other types of body movement: voluntary. Smooth: walls of hollow organs, blood vessels, eye, glands, skin, functions: propel urine, mix food in digestive tract, dilating/constricting pupils, regulating blood flow, controlled involuntarily by endocrine and autonomic nervous systems. In some locations, autorhythmic: cardiac, autorhythmic, controlled involuntarily by endocrine and autonomic nervous systems. Functions: movement of the body, maintenance of posture, respiration, production of body heat, communication, constriction of organs and vessels, contraction of the heart. Contractility ability of muscle to shorten with force. Excitability capacity of muscle to respond to a stimulus (from our nerves) Extensibility muscle can be stretched to its normal resting length and beyond to a limited degree. Elasticity ability of muscle to recoil to original resting length after stretched. Composed of muscle cells (fibers), connective tissue, blood vessels, nerves. Tend to be smaller diameter in small muscles and larger in large muscles. Striated appearance due to light and dark banding.

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