exercise 13

Question 1

antagonistic muscles

Answer 1

muscles that work in opposition to each other

Question 2

agonist

Answer 2

muscle that gives movement desired

Question 3

antagonist

Answer 3

muscle that opposes desired movement

Question 4

wrist extension and flexion

Answer 4

flexion - flexor carpi radialis, flexor carpi ulnaris, palmaris longus
extension - extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris

Question 5

arm wrestling

Answer 5

pronator teres and biceps brachii

Question 6

what does an EMG measure

Answer 6

the changes in skin voltage as a result of the electrical activity of the skeletal muscles

Question 7

The forearm is pronated in the winning position. Which muscle increased its EMG activity

Answer 7

pronator teres

Question 8

how does the length of a muscle change when it perform a concentric contraction?

Answer 8

shortens

Question 9

in the relaxed position

Answer 9

pronator teres and biceps brachii are at optimal length

Question 10

in the winning position

Answer 10

pronator teres is less than optimal length

biceps brachii is greater than optimal length

Question 11

in the losing position

Answer 11

pronator teres is greater than optimal length

biceps brachii is greater than optimal length

Question 12

which muscles were agonist muscles during flexion

Answer 12

anterior muscles

Question 13

which muscles were agonist muscles during extension

Answer 13

posterior muscles

Question 14

tonus

Answer 14

constant maintenance of muscle tone