Muscle Contraction Mechanism Fit in the spaces below ta idenoby the st.pdf

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Muscle Contraction Mechanism Fit in the spaces below ta idenoby the structures lateled by uner in the inages and complese a synopsis of the mechaniam of muscle contacion. The sigral to contract reaches the muscle fber at the (A) The nerve imputse reaches the end of the motor neuron, calted the (B) The (C) (membranous sacs) fuse with the PM of the motor neuron and release (D) the specific neurotransmitter for comminication wath muscies, which diffses across the space between the cells, called the (E). and binds to ( F ) in the PM of the muscle tiber, which intiates a(n) (not pictured) that travels dosn the length of the PM of the muscle fiber and Iravels down turnets from the PM called (G) This stimulates the ( H ) to release (not pictured uniti later) ions. Muscle Contraction Mechanism (continued) Each (J) (the corifactle unt of a muscle fiber) is separated from the next by proten bands. Their shape oves them the name Rows of altemative miscle fibers slide along each other to perlorm a contraction. Wrapping around the outside to form each rov are the thin (L). fibers. In the midde of each roware the thick (M0) fiber5. The ( M ) . fibers attach to the (L) fibers and pull ioward the certer durhg contraction to shorten the length of the (J) If we zoom in on the (L) and (M) protein fbers, to look at how they interact during contraction and relaxation, we see the wo regulatory proteins, called (N) and. (O) fo (L) when the (J) is relaced. When the muscle receives the signal to cortinct. (Q ions rush into the (J) and binds to ( 0 ciusing the (N) to move out of the way and allow the to bind io (L).

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