A&P Question Please Help

[msdeannah]

I have my exam on Saturday, and no matter how much I read it. I can't wrap my head around isometric concentric and eccentric contractions. Can anyone help. I've been searching for examples that would make it easier to understand but no luck.

Thanks in advance.

[osagarese]

i found this maybe it will help

http://muscle.ucsd.edu/musintro/contractions.shtml

http://www.answers.com/topic/muscle-contraction

also

definition: an eccentric contraction occurs when a muscle is contracting, and an external force is trying to lengthen the muscle. the classic mechanism for a muscle strain is an eccentric contraction. eccentric contractions are the common cause of injuries such as a groin pull or hamstring strain.

isometric

definition: a contraction in which a muscle exerts force but does not change in length. isometric contractions are common in activities such as yoga and stretching.

concentric contraction occurs when a muscle shortens in length and develops tension e.g. the upward movement of a dumbbell in a biceps curl or as you spring back from a jump landing, extending your knees and jumping back up in the air, the quadriceps are shortening as they create force to push you off.

hope this helps :-)