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Muscle Tissue DS

Muscle Directed Study 10/1/12

What are the features of smooth muscle? elongated nuclei, spindle shape of cells. Found in the walls of organs and in blood vessels. Myofilaments arranged randomly enable cells to stretch
What are the features of skeletal muscle? nuclei on the outer side of cells. Overlapping filaments create striation pattern.
What are muscle spindles? Fibers found in the belly of the muscle. They detect changes in length of the muscle.
What is the A-band composed of in a skeletal muscle? entire length of a single thick filament.
What is the I-band of in a skeletal muscle? zone of thin filaments that is not superimposed by thick filaments
What are the Z-discs composed of in a skeletal muscle? Series of dark lines between the I bands where two cells meet
What are the features of cardiac muscle? Found only in the heart, Y-shaped cells that are shorter than skeletal muscle cells, intercalated discs located between cells
What are the features of cardiac myocyte nuclei? Nuclei are larger than in skeletal muscle and centrally located
What are intercalated discs? Where two cardiac myocytes meet. Help muscle to contract as a unit
What is the epicardium? Outer CT layer of heart tissue.
What is endocardium? Lines chambers of the heart
What are purkinje fibers? Part of the heart's conductive system
What do epimysium line? Entire muscle
What do perimysium line? Groups of muscle fibers into fascicles
What do endomysium line? Individual muscle fiber
What are the three types of cell junctions in intercalated discs? fascia adherens, macula adherens, gap junctions
What is the function of the fascia adherens? Anchoring site for actin, connect to the closest sacromere
What is the function of the macula adherens? Stop separation during contraction by binding intermediate filaments. Also called desmosomes
What is the function of the gap junctions? Allow action potentials to spread between cardiac cells
What is the structure of purkinje fibers in the heart? Originates in the SA node. Fibers are split into left and right trees as well as atrial and ventricular contributions. Appear "fuzzy"
What is the function of purkinje fibers in the heart? Carry the contraction impulse from the left and right bundle branch to the myocardium of the ventricles
What is the location of purkinje fibers in the heart? just below the endocardium in the inner ventricular walls of the heart
Created by: 583931909