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Muscular Dayani Solano Per.2 - Coggle Diagram
Muscular Dayani Solano Per.2
Major functions of the muscular system
Protection
muscle protection is by protecting us of atrophy, when you lack of physical activity
Heat generation
all muscles produce heat when muscles contract requiring energy to function
Support
support from the muscles helps the blood go to heart; the support from your skeletal help your muscles
Movement
Skeletal muscles pull on the bones causing movement
pull on the soft tissues of the face causing facial expressions.
Blood circulation
carries blood away from and towards the heart: carrying nutrietion, oxygen and cells
Sarcomere
thin filaments
occupy the center of the sarcomere
over-lap with thin filaments
thick filaments
actin
located in skeletal and cardiac forms
Sliding filament theory of muscle contraction
myosin head slides
skeletal muscle contraction has occurred
cross bridge forms
troponin
calcium ions are released by the sarcoplasmic reticulum in the actin filament
Muscle coverings
perimysium
sheath of connective tissue that groups muscle fibers into bundles
endomysium
wispy layer of areolar connective tissue
epimysium
fibrous tissue envelope that surrounds skeletal muscle
Names of all the skeletal muscles
trapezius
responsible for posture and movement
controls your scapula
latissimus dorsi
perform actions of the upper extremity
stabilize your back
deltoid
main muscle of the shoulder.
contains anterior, middle, and posterior fibers
erector spinae
straightens the back and provides for rotations from your sides
can hold the thoracic and lumbar regions
pectoral
it connects the front of the human chest
triceps
extension of the elbow joint
stabilizes the shoulder
biceps
muscle on the front part of the upper arm
attached to the arm bones by tendons
3 types of muscles & their functions
cardiac
provides the pumping action of the heart
muscular pumping device
found in the heart
involuntary
smooth
provides movement of viscera peristalsis
smooth muscles contain
skeletal
providing muscles movement of bones at joints maintaining posture
body's central frame
Action potential in a muscle fiber
actin and myosin cross-bridge formation
sliding mechanism of actin and myosin filaments
the depolarization and calcium ion release
the muscle contract which means sarcomere shorten
Neuromuscular junction
the electrical gated calcium channels open
the calcium causes vesicles to
release ¨ach¨ to the synaptic cleft
step 1. ap travels down the axon, to the axon terminal
¨ach" diffuses across the synaptic cleft
ACH binding opens ion channels
at the motor end plate AP occurs on the muscle
¨ach¨ is broken down by
acetylcholine esterase