TCA - AM 2 Upper Extremity muscles Payday

Last updated about 5 years ago

9 questions

2

1

2

10

1

3

Last updated about 5 years ago

9 questions

2

Which muscle(s) contributes to forearm flexion?

2

1

1

1

2

10

1

3

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

Calcium binds to troponin, shifting tropomyosin to unblock actin-binding sites
With ATP present, ATPase splits ATP to ADP + P + Energy
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
Calcium is actively pumped back to SR
Myosin heads combine with actin-binding sites
Motor nerve impulses (AP) to the neuromuscular junction
Ach released by the synaptic vesicles crosses synaptic cleft; then acetylcholinesterase breaks down Ach
Impulse stops, calcium or ATP depleted, calcium ions return to SR
Sliding action of actin over myosin (Sliding Filament Theory)
Calcium ions released from SR and binds with troponin

pronation 

adducts wrist

abducts wrist

anterior, distal phalynx of digits 2-5

Pronates forearm

Match the muscles of the lower extremity to the appropriate description

Deltoids

O: anterior surface of ribs 3-5; I: coracoid process

Levator scapulae

I:  upper medial border of scapula; A: elevates and adducts scapula

Teres major

O: T2-T5, I: medial border of scapula

Rhomboid major

O: C7-T1, A: retracts and rotates scapula to rest position

Pronator Teres

A: extends and adducts arm: I: intertubercle groove of humerus

Triceps brachii

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

Pectoralis minor

O: supraglenoid tubercle of scapula & coracoid process of the scapula, I:  posterior border of bicipital/radial tuberosity of radius 

Biceps brachii

I: lateral shaft/convexity of radius, A: pronates and flexes forearm

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     

Calcium is actively pumped back to SR

Myosin heads combine with actin-binding sites    

Motor nerve impulses (AP)  to the neuromuscular junction

Ach released by the synaptic vesicles crosses synaptic cleft; then acetylcholinesterase breaks down Ach     

Impulse stops, calcium or ATP depleted, calcium ions return to SR

Sliding action of actin over myosin (Sliding Filament Theory)

Calcium ions released from SR and binds with troponin