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Muscular System (Movements (Elevation - Moving a body part up, Depression …
Muscular System
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Muscles
- Produce movement
- maintain posture
- stabilize joints
- generate heat
Arm and hand
- Abductor Hallucis
- Biceps brachii
- brachioradialis
- deltoid
- extensor carpi radialis
- extensor carpi ulnaris
- flexor carpi radialis
- flexor carpi ulnaris
- flexor digitorum
- pronator teres
- supinator
- triceps brachii
Chest and upper back
- Infraspinatus muscle
- latissimus dorsi
- levator scaplae
- serratus anterior muscle
- trapezius
- teres minor
- teres major
- sternohyoid
Abdomen and lower back
- External abdominal oblique
- Internal Abdominal oblique
- rectus abdominus
thoracolumbar fascia
Legs
-Vastus Medialis Muscle
- Vastus Lateralis Muscle
- Tibialis Posterior Muscle
- Tibialis Anterior Muscle
- Superior Extensor Retinaculum
- Soleus Muscle
- Semitendinosus Muscle
- Semimembranosus muscle
- Sartorius Muscle
- Rectus Femoris Muscle
- Quadriceps femoris tendon
- Plantaris tendon
- Adductor brevis muscle
- Adductor longus muscle
- Adductor magnus muscle
- Biceps femoris muscle
- Calcaneal tendon
- Extensor digitorum brevis muscle
- Extensor digitorum longus muscle
- Extensor digitorum muscle
- Gluteus maximus muscle
- Gluteus minimus muscle
- Gastrocnemius muscle
- iliopsoas muscle
types of muscle tissue
Smooth
- propels substances, found in lining of organs, involuntary , not striated
Cardiac
- Contracts the heart to pump blood, involuntary, striated
Skeletal
- Movement, manipulating our environment, voluntary, striated
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Sliding filament theory
The sliding filament theory is the explanation for how muscles contract to produce force. Actin and myosin filaments within the sarcomeres of muscle fibers bind to create cross bridges and slide past each other. This creates a contraction.
Muscle contraction
- Motor nerve stimulates an action potential to pass down to the neuromuscular junction. This causes the SR to release calcium into the cell
- Calcium floods into the muscle cell, binding with troponin allowing actin and myosin to bind. The actin and mysosin crossbridges bind and contract using ATP
- ATP is re-synthesized allowing actin and myosin to maintain their strong binding state
- Relaxation. Calcium is pumped back into the SR
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