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38)What is released from the structure labeled "9"?38)A)proteinB)acetylcholinesteraseC)acetylcholineD)calcium ionsE)sarcoplasm39)Where would calcium ions be predominately found?39)6
40)Which structure actively pumps calcium ions out of the sarcoplasm to produce relaxation?40)41)Where are the myosin molecules located?41)42)Which structure contains the motor end plate?42)A)5B)3C)2D)1E)843)Identify the structure where ATP is produced.43)44)Where is ATP is consumed?44)45)In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulumreleases45)
46)Each skeletal muscle fiber is controlled by a motor neuron at a single46)A)neuromuscular junction.B)synaptic knob.C)sarcomere.D)transverse tubule.E)synaptic cleft.47)The narrow space between the synaptic terminal and the muscle fiber is the47)48)Active sites on the actin become available for binding after48)
49)Receptors for acetylcholine are located on the
50)The action potential is conducted into a skeletal muscle fiber by50)A)motor end plates.B)transverse tubules.C)neuromuscular junctions.D)sarcoplasmic reticulum.E)triads.51)The most important factor in decreasing the intracellular concentration of calcium ion aftercontraction is51)
52)Which of the following acts as an ATPase during the contraction cycle of muscle?52)53)When calcium ion binds to troponin,53)