#3 Flashcards
skeletal muscles are responsible for moving
bones
what chemical helps to regenerate ATP
creatine phosphate
muscle fibers are made of individual fibers ( not filaments) called
myrofibril
connective tissue that surrounds fasicles is
perimysium
poisons such as botulism that prevent the release of acetylcholine would cause muscles to
contract
voluntary
skeletal
involuntary
smooth, cardiac
what neurotransmitter is associated with the muscles
acetycholine
makes up the heart
cardiac
found in digestive system
smooth
what cell organelle provides atp needed for muscle activity
mitochondria
the gap between the nerve and the muscle is called the
synapse
muscles grow/ enlarge
hypertrophy
muscle shrinkage/ become smaller
atrophy
a person who has a disease that inhibits the production of cholinesterase would have what kind of symptoms
muscles stay contracted
cholinesterase is an enzyme that breaks down
acetylcholine
during a muscle contraction, cross bridges from between what two structures
actin and mysoin
in a sacomere, the band I is made of
actin
band A is made of
mysoin
the dark and light fibers of the muscles give cells a ____ appearance
striated
the energy source for muscle contraction is
ATP
vesicles in the motor neuron store what substance
acetycholine
when recruitment occurs, the number of motor units being activated
increase
sustained contraction of individual fibers, even when muscle is at reset is known as
muscle/ tone
the immovable ends of the muscle is the
origin
the movable end of the muscle is
insertion
muscle fatigue is likely due to a buildup of
lactic acid
a sacromere is defined as the region between two
z lines
the condition where a body becomes stiff after death is called
rigor mortis
when atp has been used it becomes
ADP
what is a motor unit
a neuron and the skeletal muscle fibers
myofibrils are composed of
muscle fibers
the muscle fiber membrane is specialized to form a _____ at the neuromuscular junction
motor end plate
which type of connective tissue surrounds fascicles ( bundles)
perimysium
what type of tissues surrounds the entire muscle
epimysium
the substance that crosses the gap between a neuron and a muscle fiber is the
acetylcholine
tendons connect ____ to ____
muscle, bone
bundles of muscle fibers are called
fascicles
the minimum amount of stimulus required for a muscle contraction to occur is the
threshold
what model explains how muscles contract
sliding filament theory
the A bands are
dark
the I bands are
light
