When a heavy object in hand is lowered, the extension at elbow is brought about by (AIIMS 2003)
a) Active shortening of the extensors
b) Passive shortening of the extensors
c) Active lengthening of the flexors
d) Active shortening of the flexors
Answer- c
Explanation:
When a heavy object in hand is lowered, the extension at elbow is brought about by active lengthening of the flexors.
When a heavy object in hand is elevated, the extension at elbow is brought about by active shortening of the extensors.