muscle Flashcards
Muscle fatigue is the result of the lack of_____and the production of ____
oxygen and ATP
The mechanical force of contraction (shortening) is generated by:
actin and myosin
A skeletal fasciculus is surrounded by a connective tissue wrapping called the:
perimysium
Myosin is the primary component of the:
thick filament
In response to a nerve impulse, the electrical charges on the sarcolemma are
reversed. This is called:
depolarization
The neurotransmitter involved with skeletal muscle contraction is:
Acetylcholine (ACh)
In skeletal muscle calcium ions are stored and released from the:
sarcoplasmic reticulum (SR)
Myofilaments consists of:
thick filaments (myosin) and thin filaments (actin)
Muscle tissue, one of the four basic tissue groups, consists chiefly of cells that are highly specialized for
contractions
At each end of the muscle, the collagen fibers of the epimysium, and each perimysium and endomysium, come together to form a
tendon
Nerves and blood vessels that service a muscle fiber are located in the connective tissues of its
endomysium
A fascicle is
bundle of skeletal muscle fibers
Interactions between actin and myosin filaments of the sarcomere are responsible
for
muscle contraction
The advantage of having many nuclei in a skeletal muscle fiber is
ability to produce large amounts
of muscle protein
Describes the term sarcomere
the main functional unit of muscle
fiber in the skeletal muscle
The narrow space between the synaptic terminal and the muscle fiber is the
synaptic cleft
Active sites on the actin become available for binding after
myosin binds to troponin
When acetylcholine binds to receptors at the motor end plate, the end plate
membrane becomes
opens to ions
Synaptic vesicles contain neurotransmitters that are released by_______ when the action potential arrives.
exocytosis
V A patient takes a medication that blocks ACh receptors of skeletal muscle fibers. What is this drug’s effect on skeletal muscle contraction?
reduces contraction
The rapid rise and fall in force produced by a muscle fiber after a single action
potential
twitch
