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Muscle Tissue

A&P Chapter 10 Dr. Cutler

What are the 3 types of Muscular Tissue? Skeletal, Cardiac, and Smooth
What are the characteristics of the skeletal muscular tissue? Voluntary, Striated (striped), and moves bones at the joints
What are the characteristics of the cardiac muscular tissue? Involuntary, pacemaker cells, and intercalated discs
What are the characteristics of the smooth muscular tissue? Involuntary, hollow organs (GI tract) and blood vessels
What are the properties of muscule tissue? Excite, Contract, Elastic, and Extend
What does the muscule tissue property, excite do? It's responsive to stimulus from the nervous system (stretching)
What does the muscle tissue property, contract do? It creates tension when the muscle is stimulated
What does the muscle tissue property, elastic do? It recoils to resting length after tension is removed
What does the muscle tissue property, extend do? It extends when the opposing muscle is contracted (flexed)
What are the functions of muscle tissue? Body movement, Posture, Temperature regulation, Storage and movement of materials, and Support
What does body movement do? It allows movement between the muscles, bones and joints
What does posture do? It prevents you from collapsing
What does temperature regulation do? Produces heat when muscles contract, causes you to shiver
What does the function, storage and movement of materials, do? Keeps urine, bowel and stomach contents in by using sphincters (circular muscle bands) at orifices (openings)
What does the function, support, do? Supports weight and push of organs in the abdomen and pelvic cavities
What is a Fascicle? Bundle of muscle fibers
What is another name for muscle fibers? Muscle Cell
What does muscle fibers contain? Myofibrils
What are myofibrils made of? Monofilaments
What is a Sarcomere? A contractile unit of muscle cell/fiber
What is a Sarcoplasmic Reticulum? Membranes of hollow tubes that stores calcium
What are the 3 concentric layers in the connective tissue in muscles? Endomysium, Perimysium, and Epimysium
What are the functions of concentric layers? It encircles each individual muscle fiber, groups of muscle fibers and the entire muscle itself
What is the innermost layer of connective tisssue in muscles? Endomysium
What does the perimysium do? Surrounds bundles of muscle fibers (fascicles)
What does epimysium do? Outermost layer that surrounds the entire skeletal muscle
What are the 2 kinds of Fascia? Deep fascia and superficial fascia
What are the properties of the deep fascia? Separates individual muscles, binds together muscles with similar functions and fills spaces between muscles
What does the superficial fascia do? Separates muscle from skin
What are the types of muscle attachments? Tendon, Origin, Insertion
What is an Aponeurosis? A thin, flat sheet of tendon
What do Tendons do? Attaches muscle to bone
What is Origin? The less moveable attachment of a muscle
What is Insertion? The more moveable attachment of a muscle
What are Motor Neurons? Nerve cells that stimulate muscle contraction
What are Axons? The long extension from the neuron cell body to the muscle. Transmits electricals impulses to the muscle fibers
What is the Neuromusular Junction? The junction between the axon and muscle fiber itself
What is the Sarcolemma? The plasma membrane of a muscle fiber
What does the Sarcolemma contain? Transverse Tubules
What do Transverse Tubules do? Transmits nerve signal and electricity
What is the Sarcoplasm? Cytoplasm of a muscle fiber
What does the Sarcoplasmic Reticulum (SR) do? Reservoir for calcium ions
What is a Terminal Cisternae? Sacs at the end of the Sarcoplasmic Reticulum that collect calcium
What is a Myofibril? Long, cylinder-shaped structures ina skeletal muscle fibers
What is a Myofilament? Makes up myofibrils
What are the 2 smallest units of Myofilaments? Actin and Myosin
What is a Actin? A thin filament thats a binding site for Myosin
What does Actin do? Slides along the length of Myofibril during muscle contractions
What is a Myosin? A thick filament that has a binding site for Actin
What does Troponin do? Bounds to Actin and holds tropomyosin in place to cover the myosin binding site
What does Tropomyosin do? Bounds to Actin and covers the myosin binding site
What is the Sarcomere? The functional contractile unit of a skeletal muscle fiber
What is the Sliding Filament Theory? When thin filaments slide past thick filaments
What are the parts of a Neuromuscular Junction? Synaptic Vesicles, Motor End Plate, Synaptic Cleft, AcH receptors, and Acetylcholinesterase
What is the Neuromuscular Junction? The point where a motor neuron meets a skeletal nerve fiber
What does Synaptic Vesicles contain? Acetylcholine (AcH)
What is the Motor End Plate? The folded region of a sarcolemma under the Axon Bulb
What is the Synaptic Cleft? The space between the Axon Bulb and the Motor End Plate
What are Acetylcholine Receptors? Pick up Synaptic Cleft, released from the Axon Bulb of Neuron during a nerve impulse response
What is the Acetycholinesterase? An enzyme in the Synaptic Cleft that breaks down AcH
What controls Muscle Tension? A Motor Unit
What does the strength of a contraction depend on? How many Motor Units are activated
Created by: delainaxrepola