TCA - AM 2 Upper Extremity muscles Payday - Tracy Wiese | Library

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Which muscle(s) contributes to forearm flexion?

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Draggable item		Corresponding Item
Pectoralis minor		O: anterior surface of ribs 3-5; I: coracoid process
Teres major		I: upper medial border of scapula; A: elevates and adducts scapula
Rhomboid major		O: T2-T5, I: medial border of scapula
Biceps brachii		O: C7-T1, A: retracts and rotates scapula to rest position
Triceps brachii		A: extends and adducts arm: I: intertubercle groove of humerus
Deltoids		O: acromion, spine of scapula and lateral 1/3 of clavicle, A: abducts, extends and medially & laterally rotates the arm
Latissimus dorsi		O: inferior border of scapula, A: medially rotates and adducts arm
Rhomboid minor		A: extends forearm, I: olecranon process
Pronator Teres		O: supraglenoid tubercle of scapula & coracoid process of the scapula, I: posterior border of bicipital/radial tuberosity of radius
Levator scapulae		I: lateral shaft/convexity of radius, A: pronates and flexes forearm

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Ach released by the synaptic vesicles crosses synaptic cleft; then acetylcholinesterase breaks down Ach
Tropomyosin covers binding sites, myosin no longer bound
Sodium ions enter the muscle fiber, initiating an action potential that travels down the T-tubules to the Terminal Cisternae
Impulse stops, calcium or ATP depleted, calcium ions return to SR
Calcium is actively pumped back to SR
Calcium binds to troponin, shifting tropomyosin to unblock actin-binding sites
Calcium ions released from SR and binds with troponin
Myosin heads combine with actin-binding sites
With ATP present, ATPase splits ATP to ADP + P + Energy
Sliding action of actin over myosin (Sliding Filament Theory)
Motor nerve impulses (AP) to the neuromuscular junction