Muscular Flashcards
Connective tissue sheath
Epimysium
Visible bundles
Muscle fascicles
separates fascicles from each other
Perimysium
loose connective tissue that surrounds each muscle fibers
Endomysium
cell membrane of the muscle fibers
sarcolemma
Cytoplasm of muscle fiber
Sarcoplasm
bundles of protein filaments on each muscle fibers
myofibrils
basic structural and functional unit of skeletal system
sarcomeres
Stimulate muscle to contract
motor neurons
General term of neuromuscular
synapse
Shorten forcefully of contract
Contractility
respond to a stimulus
Excitability
Stretched to their normal resting length and beyond to a limited degree
Extensibility
to recoil after they have been stretched
Elasticity
can be seen in the muscle under the microscope
transverse bands
Epimysium is also called
muscular fascia
highly organized smooth endoplasmic reticulum
sarcoplasmic reticulum
light staining band of sarcomere
I band
dark staining band of sarcomere
A band
is the center of each A band
H zone
Also called thin filaments
Actin myofilaments
also called thick filaments
myosin myofilaments
the inside of the cell membrane is
negatively charged
the outside of the cell membrane is
positively charged
motor neurons
specialized nerve cells that stimulates muscles to contract
space between the presynaptic terminal and the muscle fiber membrane
synaptic cleft
the axon terminal
presynaptic terminal
postsynaptic membrane
sarcolemma
sarcomeres shorten
contraction
sarcomeres lengthen
relaxation
contraction of muscle fiber in response to a stimulus
muscle twitch
time between the application of a stimulus and the beginning of contraction
lag phase
time during which the muscle contracts
contraction phase
muscle relaxes
relaxation phase
individual muscle contract more forcefully
summation
sustained contraction that occurs when the frequency increases
tetanus
force of contraction of individual muscle fibers is increased by rapidly stimulating them
summation
the number of muscle fibers contracting is increased by increasing the number of motor units stimulated
recruitment
contains I myosin as the predominant or even exclusive type
slow-twitch muscle
works aerobically
slow-twitch fiber
suited working anaerobically
fast-twitch fiber
contract slowly
slow-twitch
contract quickly
fast twitch
required O2 to breakdown glucose
Aerobic respiration
does not require O2
Anaerobic respiration
temporary state of reduced work capacity
fatigue
most common type of fatigue,involves the central nervous system rather than the muscle themselves
psychological fatigue
occurs when there is too little ATP to bind myosin myofilaments
physiological contracture
is the constant tension produced by body muscles over long period of time
muscle tone
Increase the tension in the muscle without changing it’s length
Isometric contractions
have constant amount of tension
isotonic