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Muscular Erika Castro-Dominguez Period 1 - Coggle Diagram
Muscular
Erika Castro-Dominguez
Period 1
3 types of muscle
Cardiac
Smooth
Skeletal
Muscle fiber: single, long, and cylindrical muscle cell
Sarcolemma:cell membrane of a muscle fiber
Sarcoplasm: Cytoplasm of a muscle cell and contains many
mitochondria and nuclei. It also has myofibrils
Thick and thin filaments produce striations
Thin is made by proteins called
actin, troponin, and tropomyosin
Thick is made the protein myosin
sarcoplasmic reticulum: endoplasmic reticulum of a muscle cell
It is associated with t-tubules
T tubule: lie between 2 cisternae of the sarcoplasmic
reticulum;
sarcoplasmic reticulum and transverse tubules activate the
muscle contraction mechanism once fiber is stimulated
Functions of muscle
Neuromuscular Junction
Skeletal muscle fibers contract only
when stimulated by a motor neuron
synapse:created by a skeletal muscle fiber cell that is functionally but not physically
connected to the axon of a motor neuron,
neurotransmitters: allow neurons to communicate with muscle fiber by chemicals released by the synapse
Neuromuscular junction: a synapse between a motor neuron and a muscle fiber that it regulates
cytoplasm: are the distal end of the motor neuron and has mitochondria and synaptic vesicles storing neurotransmitters
the motor end plate, in which the sarcolemma is tightly folded an has certain receptors
Sliding filament theory
Disorders with muscles
muscle covering
Fascia: Layers of dense connective tissue.
It surrounds and separates each muscle
Gives rise to tendons that are fused to the periosteum
Aponeuroses: connective tissue that connects some muscles
Epimysium: layer of connective tissue
around each skeletal muscle
Perimysium: surrounds
bundles of skeletal muscle fibers(fascicles)
Endomysium: covers muscle fibers
Sacromere
sarcomere extends from one Z line
I bands (light bands) are made up of actin filaments
A bands(dark bands)
made up of overlapping
thick and thin filaments
In the center of the A band is the H zone, which consists of myosin
M line, in the center of the H zone