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Anatomy: Muscles

TermDefinition
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
each skeletal muscle is surrounded by a connective tissue sheath called the _____? epimysium
another connective tissue located outside the epimysium. it surrounds and separates muscles? fascia
a muscle is composed of numerous visible bundles called muscle fasciculi, which is surrounded by loose connective tissue called _____? perimysium
the fasciculi are composed of single muscle cells called _____? fibers
Each muscle fiber is a single cylindrical cell containing _____ _______? several nuclei
each fiber is surrounded by a connective tissue sheath called the _____? endomysium
the cytoplasm of each fiber is filled with _____? myofibrils
myofibrils threadlike structure that extends from one end of the fiber to the other
myofibrils consist of 2 major kinds of protein fibers ? actin myofilaments and myosin myofilaments
actin myofilaments thin myofilaments. They resemble 2 minute strands of pearls twisted together.
myosin myofilaments thick myofilaments. They resemble bundles of minute golf clubs.
actin and myosin filaments form highly ordered units called ______? sarcomeres
sarcomere the basic structural and functional unity of the muscle
_____? are joined end to end to form the myofibril sarcomeres
each sarcomere extends from one z line to another z line . each z line is an attachment site for _____? actin
the arrangement of actin and myosin give a ____ appearance? banded
on each side of the z line is a light area called an I band, it consists of _____? actin
the _ _____ extends the length of of the myosin? A band
the A band is the _______ central region in each sarcomere? darker
in the center of each sarcomere is another light area called the _ ____, which consists of only myosin? H zone
the myosin myofilaments are anchored in the center of the sarcomere at a dark staining band called the _ ____? M line
Created by: taylorkennedy