How would the diagram above appear if the sarcomere contracted?

The myosin filaments would be longer.
The myosin filaments would be shorter.
The cross bridge would move the actin filaments towards the center of the myosin.
The cross bridge would move the actin filaments away from the center of the myosin.

C. The cross bridge would move the actin filaments towards the center of the myosin.

Explanation:

Contraction of a muscle is a process in which the sarcomere shortens after being adequately stimulated.

Two main proteins involved in this process are actin and myosin. In a state of relaxation, they are not binded, because their binding places are blocked. After the stimulation, these binding places are free, so the two proteins bind and form the cross bridge.

Now, actin filaments slide from one to another binding places along the length of a myosin fibers, like a paddle of the boat across the water.

Note that during this process actin and myosin don't change their length; the sarcomere shortens because the actin filaments slide towards the center of the myosin fibers.

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1. read the following excerpt from franklin d. roosevelt's "fireside chat 19":

on the other side of the picture, we must learn also to know that guerilla warfare against the germans in, let us say serbia or norway, us; that a successful russian offensive against the germans us; and that british successes on land or sea in any part of the world strengthen our hands.

remember always that germany and italy, regardless of any formal declaration of war, consider themselves at war with the united states at this moment just as much as they consider themselves at war with britain or russia. and germany puts all the other republics of the americas into the same category of enemies. the people of our sister republics of this hemisphere can be honored by that fact.  

the true goal we seek is far above and beyond the ugly field of battle. when we resort to force, as now we must, we are determined that this force shall be directed toward ultimate good as well as against immediate evil. we americans are not destroyers — we are builders.

analyze the effectiveness of this excerpt. how does it function within the speech as a whole? how does the structure of the excerpt to convey the speech's purpose and key points? support your argument with evidence from the speech. (10 points)