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Muscular System Ozil Villicana Per. 1 - Coggle Diagram
Muscular System Ozil Villicana Per. 1
Major functions of the muscular system
Stabilize joints:
Muscles act as a stabilizer for bones and organs
Produce heat:
Muscles generate heat as they move
Maintain posture:
Helps maintain posture and body position/alignment
Aid Movement:
Responsible for all locomotion/manipulation
Skeletal muscles
Deltoid
Trapezius
Stemohyoid mastoid
Serratus Anterior
Stemohyoid
External obliques
Masseter
Rectus abdominus
Buccle
Pectoralis major
Orbicularis oris
Brachialis
orbicularis oculi
Briceps Brachii
Zygomaticus
Brachuiradials
temporalis
Flexor Carpi Radials
Frontalis
adductor
tensor faciae lataw
soleus
ilioposeas
tibialis anterior
flexor carpi ulnaris
Rectus femoris
Palmaris longus
Vastus medials and lateralis
Muscle coverings
Perimysium: Fibrous connective tissue surrounding fascicles
Endomysium: Fine areolar connective tissue surrounding each muscle fiber
Epimysium: Dense irregular CT surrounding entire muscle
Neuromuscular junction
4. ACh Binding:
ACh diffuses across cleft binds to sodium and potassium channels
5. Muscle depolarization:
Sodium enters the muscle fiber, depolarization in EPP
3. Neurotransimitter release:
ACH is realeased into the syaptic cleft
6. Muscle action potential:
EPP reaches threshold, sodium channels open triggers contraction
2. calcium channels
Depolarization opens voltage gated calcium channels, calcium enters
7. Clean up:
AChE breaks down remaining Ach in cleft
1. Action potential arrives:
Electrical impulse travel to motor neuron
Sliding filament theory of muscle contraction
Myosin heads bind to actin creating a cross-bridge
Myosin head pulls actin towards the center of the sarcomere
Calcium binds to troponin, shifts in binding sites
ATP molecule binds to the myosin head, causing it to detach from actin.
Action potential releases calcium into the sarcoplasmic reticulum
Sarcomere
Thick Filaments:
Known as Myosin, a protien than aids movement and contraction
M line:
It links and stabilizes the myosin protien
Thin filaments:
Also known as Actin which is a protien that aids in movement.
A band:
A dark region where myosin is in
Z disc
: Area where the filaments are contained
I band:
Light region where Actin is stored
3 types of muscles & their functions
Cardiac
:Involuntary muscle that pumps and circulates blood
Smooth:
Connective Tissue that aligns organs
Skeletal:
Specialized connective tissue that allows the body to move