exercise 13 Flashcards
antagonistic muscles
muscles that work in opposition to each other
agonist
muscle that gives movement desired
antagonist
muscle that opposes desired movement
wrist extension and flexion
flexion - flexor carpi radialis, flexor carpi ulnaris, palmaris longus
extension - extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris
arm wrestling
pronator teres and biceps brachii
what does an EMG measure
the changes in skin voltage as a result of the electrical activity of the skeletal muscles
The forearm is pronated in the winning position. Which muscle increased its EMG activity
pronator teres
how does the length of a muscle change when it perform a concentric contraction?
shortens
in the relaxed position
pronator teres and biceps brachii are at optimal length
in the winning position
pronator teres is less than optimal length
biceps brachii is greater than optimal length
in the losing position
pronator teres is greater than optimal length
biceps brachii is greater than optimal length
which muscles were agonist muscles during flexion
anterior muscles
which muscles were agonist muscles during extension
posterior muscles
tonus
constant maintenance of muscle tone