Muscle Contraction

Item #1 of 10

Dynamic contraction of muscles _____________________.

is caused by the shortening of extrafusal muscle fibers;

is caused by the shortening of intrafusal muscle fibers;

may cause either flexion or extension;

both alternatives a and c are correct;

both alternatives b and c are correct;

CORRECT - Yes, dynamic contraction of muscles is induced by the shortening of extrafusal fibers. The placement of these fibers across the joint will determine whether the movement caused is flexion or extension.

[Review Part 1 of the tutorial] [Review Part 2 (Matching) of the tutorial]


		is caused by the shortening of extrafusal muscle fibers;
		is caused by the shortening of intrafusal muscle fibers;
		may cause either flexion or extension;
		both alternatives a and c are correct;
		both alternatives b and c are correct;