Human Anatomy, Larry M. Frolich, Ph.D. MUSCLE AND NERVE unique to animals conduct electricity (controlled fashion) allow for movement.

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Presentation transcript:

Human Anatomy, Larry M. Frolich, Ph.D. MUSCLE AND NERVE unique to animals conduct electricity (controlled fashion) allow for movement

Human Anatomy, Larry M. Frolich, Ph.D. Molecular Basis of Muscle Function Actin-Myosin model (board) EXPLAINS: MUSCLE SHORTENING MUSCLE FORCE GENERATION OR “CONTRACTION”

Human Anatomy, Larry M. Frolich, Ph.D. Mechanics of Contraction Muscle cell is unit Role of actin/myosin Action potential or depolarization of membrane makes cell “contract” (motor neuron action potential stimulates muscle membrane depolarization) Fig. 10.4

Human Anatomy, Larry M. Frolich, Ph.D. Visualizing muscle contraction Fig How actinmyosin complex (sarcomere) shorten muscle

Human Anatomy, Larry M. Frolich, Ph.D. From Actin-Myosin to Whole Muscle M & M, Fig for muscle types

Human Anatomy, Larry M. Frolich, Ph.D. Skeletal Muscle Tissue (each skeletal muscle is an organ) Cells Long and cylindrical, in bundles Multinucleate Obvious Striations Skeletal Muscles-Voluntary Connective Tissue Components: Endomysium-between fibers Perimysium-surrounds bundles Epimysium-surround whole muscle Attached to bones, fascia, skin Origin & Insertion

Human Anatomy, Larry M. Frolich, Ph.D. Smooth Muscle Tissue Cells Single cells, uninucleate No striations Smooth Muscle-Involuntary 2 layers-opposite orientation (peristalsis) Surrounds hollow organs, blood vessels Connective Tissue Component Endomysium: surrounds cells

Human Anatomy, Larry M. Frolich, Ph.D. Cardiac Muscle Cells Branching, chains of cells Single or Binucleated Striations Connected by Intercalated discs Cardiac Muscle-Involuntary Myocardium-heart muscle Pumps blood through vessels Connective Tissue Component Endomysium: surrounding cells

Human Anatomy, Larry M. Frolich, Ph.D. NERVOUS TISSUE Neurons are biggest cells in body Two basic types motor sensory Messages travel by membrane depolarization Schwann cells are insulation in peripheral nerves (none in CNS) [Thought game: trip from sensory input (e.g., hot stove) to motor response (e.g., pull back hand]

Human Anatomy, Larry M. Frolich, Ph.D.

NEURONAL JUNCTIONS Neuron-neuron or neuron- muscle NEURO- MUSCULAR JUNCTION Where neuron transmits signal to muscle to generate action potential SYNAPSE: cell junction where neurons communicate