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skeletal muscle - Coggle Diagram
skeletal muscle
neuromuscular junction:
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6) sodium ions enter muscle fiber/ potassium ions exit (cause membrane potential to be less negative)
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sliding filament theory:
1) brain sends impulse down motor neuron to neuromuscular junction releasing acetylcholine triggering muscle impulse
2) impulse hit sarcolemma down T tubules that surround myofibril releasing calcium ions into sarcoplasm reaching sarcomere
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muscle
facial/cranial
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- zygomaticus: laugh muscle
- Temporalis: retract mandible
- occipitalis: aid facial expressions
- sternocleidomastoid: allow bend/tilt/turn neck
back
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- Infraspinatus: assist shoulder rotation
- Rhomboid major: hold scapula to rib
- latissimus dorsi: adduction/extension of arm
- gluteus medius: prime mover for adduction at hip
- gluteus major: rotation at hip
- Teres major: movement of arm
abdomen
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- pectoralis major: adduction/ internal arm rotation
- serratus anterior: protract scapula
- external oblique: rotation of trunk
- rectus abdominis: movement between ribs/pelvis
Arm
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- Tricep brachii: extension of elbow
- Flexor carpi radialis: adduct/flex wrist
- Flexor carpi ulnaris: adduct/flex wrist
leg
- Bicep femoris: flexion/ lower leg rotation
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- Adductor longus: adduct thigh
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- sartorius: rotate thigh laterally
Types connective tissue:
perimysium
- surrounds bundles of skeletal muscle fibers (inside epimysium)
endomysium
- cover each muscle fiber (in perimysium)
epimysium
- around each skeletal muscle
Types of muscle:
Skeletal M:
- voluntary movement of bones at joints
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Smooth M:
- involuntary Movement of viscera
- contract to aid in digestion
Cardiac M:
- involuntary movement in the heart
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muscle function:
- organs that generate force using contractions to cause all types of movement
action potential:
- a rapid sequence of changes in the voltage across a membrane