concept map 05 Muscular Vannessa Flores P5

3 types of muscles and their functions

Skeletal muscles

Sarcomere- extends from one Z line to the next striations consist of an alternating patter of light and dark bands

Neuromuscular junction

sliding filament theory of muscle contraction

Smooth-

Cardiac-

Skeletal-

Major function: Movement of bone at joints, maintenance posture

major function:Movement of viscera, peristalsis vasoconstriction

major function:Pumping action of the heart

Brain sends signal along the motor neuron, inside the motor neuron are vesides that contain acetylcholine, it reaches the receptors on the sarcolemma which causes an impulse

The impulse travels down the membrane into the transverse tubules which causes calcium to be released from the sarc

each skeletal muscle fiber is connected to the axon of a motor neuron creating a synapse

A synapse between s motor neuron and muscle fiber that it regulates

Skeletal muscle fibers contact only when stimulated by a motor neuron

Frontals

Temporalis- closes jaw

Orbicularis- Closes eyes

Zygomaticus- raises corners of the mouth

Buccinator- makes up the cheek

Orbicularis Oris- closes lips

Sternocleidomastoid- neck muscle

Trapezius- upper back

Pectoralis Major- chest

Deltoid- shoulder

Infraspinatus- upper back, surrounds trapezius

Rhomboid Major- Upper back, next to infraspintus

Teres Major- upper back, under Rhomboid major

Abdominis- Midline of abdomen

Serratus Anterior- Lateral to the abdomen

Biceps Brachii - Upper arm

Latissimus Dosi- lower back

External oblique- Lateral to abdominus inferior to serratus anterior

Muscular system

muscles are organs that generate force to cause all types of movement

H zone- center of A bands, consists of myosin filaments

M line - center of H zone made of proteins that hold the myosin filaments in place

A bands - dark bands, Made up of overlapping thick and thin filaments

Z lines- anchor the I bands

I bands - light bands, made up of actin filaments