In mammal joints, at least two muscles are required to flex and extend body elements at the joint. Which of the following statements explains why a single muscle cannot act as both a flexor and an extensor?

0 votes

 

The muscle would have to move to a different bone to produce both actions.

The contraction of a muscle that is acting as a flexor is different from the contraction that produces extension.

A single muscle would not be strong enough to produce both actions.

A muscle can pull at a joint only through a contraction. Because muscles cannot push, a different muscle is required to move the joint in the opposite direction.

 

asked Jan 1, 2013 in Biology by anonymous
    

1 Answer

0 votes

 

A muscle can pull at a joint only through a contraction. Because muscles cannot push, a different muscle is required to move the joint in the opposite direction.

 

answered Jan 1, 2013 by anonymous

Related questions




...