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chapter 6 anatomy


contractility the ability of skeletal muscle to shorten with force
excitability the capacity of skeletal muscle to respond to a stimulus
extensibility the ability to be stretched
elasticity ability to recoil to their original resting length after they have been stretched
what do muscles help produce? heat, essential for maintenance of normal body temperature
epimysium what connective tissue sheath is it that surrounds each skeletal muscle
fascia another connective tissue located outside the epimysium, it surrounds and separates muscles
a muscle is composed of numerous visible bundles called.. muscle fasciculi
the muscle fasciculi are surrounded by loose connective tissue called.. perimysium
the fasciculi are composed of single muscle cells called.. fibers
what does each muscle fiber contain several nuclei
each fiber is surrounded by a connective tissue sheath called the.. endomysium
the cytoplasm of each fiber is filled with.. myofibrils
myofibrils a threadlike structure that extends from one end of the fiber to the other
actin myofilaments thin myofilaments
what do actin myofilaments resemble 2 minute strands of pearls twisted together
myosin myofilaments thick myofilaments
what do myosin myofilaments resemble bundles of minute golf clubs
what do actin and myosin myofilaments form highly ordered units called sacromeres
sacromeres are joined together end to end to form what the myofibril
the sacromere is the basic structural and functional unity of the what the muscle
eac sacromere extends from one ___ line to another ___ line Z line
each z line is an attachment site for what actin
the arrangement of actin and myosin give a what appearance banded
what is on each side of a z line an I band
what does an I band consist of actin
the A band extends the length of the what of the myosin
it is the _____ central region in each sacromere darker
in the center of each sacromere is another light area called the what the H zone
what does the H zone consist of only myosin
the myosin myofilaments are anchored in the center of the sacromere at a dark staining band called the what the M line
the outside of most cell membranes is ____ charged positively
the inside of the cell membrane is _____ charged negatively
the charge difference across the membrane is called the what the resting membranepotential
when a muscle cell is stimulated the membrane characteristics do what they change breifly
the brief reversal back of the charge is called the what the action potential
motor neurons are nerve cells that carry action potentials to vthe skeletal muscle fibers
axons enter the what and branch the muscle
each branch that connects to the muscle forms a what neuromuscular junction
what else does it form synapse
where is the synapse formed near the center of the cell
a single motor neuron and all the skeletal muscle fibers it innervates are called a what a motor unit
many motor units form a what a single muscle
a neuromuscular junction is formed by what an enlarged nerve terminal resting in an indentation of the muscle cell membrane
Created by: nygiantfan2



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