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concept map 05 Muscular Vannessa Flores P5 - Coggle Diagram
concept map 05 Muscular Vannessa Flores P5
3 types of muscles and their functions
Smooth
-
major function:
Movement of viscera, peristalsis vasoconstriction
Cardiac
-
major function:
Pumping action of the heart
Skeletal-
Major function:
Movement of bone at joints, maintenance posture
Skeletal muscles
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
Sarcomere
- extends from one Z line to the next striations consist of an alternating patter of light and dark bands
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
Neuromuscular junction
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
sliding filament theory of muscle contraction
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
Muscular system
muscles are organs that generate force to cause all types of movement