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MCAT Question A Day - 9/1/14 - Answer!

Muscles cause movement at jointby:

A.  incitinneuronto initiate an electrical "twitch" in tendons.
B.  increasinin lengththereby pushinthe muscle's origin aninsertion fartheapart.
C.  fillinwith bloodthereby expanding and increasinthdistance between the endof muscle.
D.  decreasinin length, thereby bringinthe muscle's origiand insertion closer together.

D is correct. Muscles cause movement by contracting (eliminating B and C), bringing origin and insertion closer together, usually by moving the insertion. Neurons cause contractions in muscles, not tendons, and the neural signals are not initiated by the muscle. This eliminates A.

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