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Marvelyn Breceda 6th period Anatomy - Coggle Diagram
Marvelyn Breceda 6th period Anatomy
Major functions of the skeletal system :check:
Skeletal muscles usually functions better in groups
relationships between muscles depend on the action
Antagonists are muscles that oppose an action
Synergists are muscles that assist the prime mover
3 types of muscles and their functions :check:
Cardiac Muscles :check:
complex membrane junctions
intercalated disc joins cells
self exciting involuntary
only found in the heart
Skeletal Muscles :check:
bieceps branchi
extensor digitarum
sternoledomastiod
external oblique
Smooth Muscles :check:
can change lenght without change in tautness
maintains a contraction longer with same amount ATP
slower to contractand relax
Names
Serratus Anterior
Rectus Abdominis
Pectoralis Major
Brachioradiaus
Bieeps Branchi
flexorcarpi radius
Deltoid
Lliopsoas
Trapezius
Palmaris Longus
Sternocledomastoid
Sartorias
Sternocleidomastoid
Gracills
Orbilcularis
Adductor Lonugs
Masseter
Rectus Femoris
Zygomaticus
Vastus Iateralis
Orbicularis Oculi
Vastus Medialis
Temporalis
Gastrocemius
Frontails
Soleus
Tibialis Anterior
Fibularis Longus
Extensor Digitorum Longur
Sarcomere :check:
A sarcomere extends from one Z line to the next pattern
A bands are dark bands made up of overlapping thick fliaments
The center of A band is the H zone , consists of myosin filaments only
I bands are made up of actin flianents
M line , center of the H zone , consists proteins that hold a myosin filaments in place
:green_cross:
Neuromuscular Junctions :check:
Neuromuscular junction : a synapse between a motor neuron and a muscle fiber that regulates
Communicate muscle fibers ( neurotransmitters)
Skeletal Muscles fibers only contract only when stimulated by a motor neuron
Sliding Filament Theory :check:
Step 3 - Calcium binds to a structure on the actin that causes it to change shape.
Step 4 - The change in shape allows myosin head to form cross- bridges between the actin and the myosin.
Step 2 - The impulse travels down on the membrane and into the transverse tubules where it causes calcium to be released from the sarcoplasimic reticulum.
Step 5 - Energy ATP is used to create a " power stroke " between the two filaments.
Step 1 - A muscle contraction starts in the brain , where signals are sent along the motor neuron .
Muscle coverings :check:
the epimysium
connective tissue
Action Potential In A Muscle Fiber :check:
Breakdown after ATP "cocks" the myosins head.
Troponin / Tropomyosin mulecules block the interactions between myosin and actin filaments.
Atp breaks cross-bridge linkages between actin and myosin filaments without breakdown of ATP itself.
The muscle fiber remains relaxed, yet read , until stimulated again.
Calcium ions are actively transported into the sarcoplasmic reticulum.
Acetylcholinesterase decomposes acetylcholine , and the muscle fiber membrane is no longer stimulated.