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Ch. 6 Muscles

Muscle Stack

Four major functional characteristics of skeletal muscles? Contractility, excitability, ectensibility, and elasticity
Connective tissue sheath surrounding skeletal muscles? Epimysium
Connective tissue located outside the epimysium? Fascia
Loose connective tissue surrounding muscle fasciculi? Perrimysium
The term for single muscle cells? Fibers
Connective tissue sheath around muscle fibers? Endomysium
The filling of each muscle fibers cytoplasm? Myofibrils
Two major protein fibers of myofibrils? Actin myrofilaments, and myosin myofilaments
The ability of skeletal muscle to shorten with force? Contractility
The capacity of skeletal muscle to respond to a stimulus? Excitibility
The ability to be stretched? Extensibility
The ability to recoil to original resting length? Elasticity
Thin myofilaments that resemble twisted pearls? Actin Myofilaments
Thick myofilaments that resemble golf clubs? Myosin Myofilaments
Basic structural and funtional unity to muscle? Sarcomere
Purpose of a Z line? Actin attachment site.
Appearance of the arrangement of actin and myosin? Banded
What creates an I band? Actin
Where is the I band? On each side of the Z line.
What is the light area in the center of sarcomere? The H zone which consists of myosin.
the anchor for Myosin myofilaments to attach to the center of sarcomere? A dark staining band called the M line.
The charge difference across the membrane? Resting membrane potential.
Brief reversal of charge? Action potential
Nerve cells that carry action potential to skeletal muscle fibers? Motor neurons
Each branch that connects to the muscle? Neuromuscular junction
Alternative name for neuromuscular junction? Synapse
A single motor neuron and all the skeletal muscle fibers it innervates? Motor unit
The term for many motor units? Muscle
The enlarged nerve terminal? Presynaptic terminal
Space between the presynaptic terminal and the muscle cell? Synaptic cleft
What each presynaptic terminal contains? Synaptic vesicles
Secretions of the synaptic vesicles? Acetylcholine
Created by: 120036536



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