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George Soria Muscular System Period …
George Soria Muscular System Period : 2
Major functions of the Muscular System
Muscles are responsible for all types of body movement.
Skeletal muscles
are attached to tendons and those tends are attached to bones.
Cardiac Muscles
form the heart wall for protection.
Smooth Muscles
control movements inside internal organs.
Name of Muscles
Deltoid (Shoulder)
Trapezius (Shoulder)
Pectoralis major (Chest)
Sternocleidomastoid (Neck)
Biceps Brachii (Arm)
Rectus abdominis (Abs)
External obliques (Stomach)
Sartorius (Thigh)
Rectus femoris (Thigh)
Soleus (Calf)
Gastrocnemius (Calf)
Rhomboid Major (Back Shoulder)
Infraspinatus (Back)
Latissimus Dorsi (Back)
Tres Major(Back)
Gluteus Maximus (Butt)
Gluteus Medius (Butt)
Semimembranosus (Thigh)
Semitendinosus (Thigh)
Biceps femoris (Thigh)
Structure and organizational levels of the skeletal muscle.
Glycogen
is for energy and
myoglobin
is for oxygen storage
Beneath the
Sarcolemma
lies the
Sarcoplasm
Epimysium: The layer of connective tissue around each whole muscle
Aponeuroses: Are broad sheets of connective tissue
Fascia: Surround and separate each muscle
Thin Filaments are composed of proteins like
actin
,
troponin
, and
tropomyosin
.
The sarcoplasm contains parallel
myofibrils
.
I bands
made-up of actin filaments are anchored to Z lines
A Bands
are made-up of overlapping
Sarcoplasmic reticulum
is associated with
transverse-tubles.
Body Movements Terminology
Insertion: The end of a muscle attached to the bone that moves when a muscle contracts.
Origin: The end of a muscle that attaches to the bone that does not move when contraction or the muscle occurs.
Flexion: Decreases the angle between two bones.
Extension: increases the angle between two bones.
Prime mover: muscle whose contraction is mainly responsible for producing a given movement
Synergist: Muscle whose contractions help the primary mover.
Antagonist: muscle whose actions oppose the action of a prime number.
Physiology of muscle contraction
Motor Neuron: Nerve cell that stimulates skeletal muscle
Motor Unit: Made of one motor neuron and cell muscle fibers
Neuromuscular Junction
Axon: Long portion of nerve releases a chemical called a neurotransmitter
Synapse: Connection between nerve with muscles and other organs.
Synaplic elect: gap between between neuron and sarloemma.