Muscular System Gisselle De Jesus Per.1

3 types of muscles and their functions

Sarcomere

sliding filament theory of muscle contraction

Muscle coverings

Disorders associated with the Muscular system

Names of all the skeletal muscles

Action potential in a muscle fiber

Major Functions of the muscular system

Neuromuscular junction

smooth

cardiac

skeletal

600 skeletal muscles,single, long, cylindrical muscle cell

elongated with tapered ends, lack striations, conatin thick and thin filaments.

Generate force to cause all types of movement

Cross bridge forms

Myosin head slides

Calcium ions

skeletal muscle contraction

cross bridge breaks

troponin

Myasthenia Gravis

Cerebral Palsy

Fibromyalgia

Myositis

Muscular Dystrophy

found in the heart, branching, striated cells, involuntary, contains intercalated discs

join end to end, extends Z line to the next, made up of I bands, A bands, H zone, and, M line

a synapse between a motor neuron and a muscle fiber that it regulates

contains: muscle fiber nucleus, motor end plate, motor neuron axon, mitochondria, myofibril of muscle fiber, folded sarcolemma, acetylcholine, synaptic vesicles, synaptic cleft

Deltoid: named for shape; shaped like a triangle

Pectoralis major: named for size and location; large size, located in
chest

Extensor digitorum: named for action; extends digits

Biceps brachii: named for number of attachments and location; has 2
origins/heads, and is found in the arm

External oblique: named for location and direction of fibers; located
near outside of body, and fibers run at a slant

Sternocleidomastoid: named for attachments; attaches to sternum,
clavicle, and mastoid process

The perimysium extends inward from the epimysium: it surrounds bundles of skeletal fibers, called fascicles, within each muscle

Each muscle cell is covered by a connective tissue layer called endomysium

Fascia blends with the epimysium, the layer of connective tissue
around each skeletal muscle

Acetylcholine is released into the synaptic cleft in response to an impulse
in the motor neuron; it then stimulates the muscle fiber

Upon receipt of the muscle impulse, the sarcoplasmic reticulum releases
its stored calcium to the cytosol of the muscle fiber