SKELETAL MUSCLE ACTIVITY
6. Complete the following statements relating to the neuromuscular junction
Insert the correct answers in the numbered answer blanks
A motor neuron and all of the skeletal muscle cells it
stimulates is called a (1) The axon of each motor neuron
has numerous endings called _(2). The actual gap between
an axonal ending and the muscle cell is called a (5)
Within the axonal endings are many small vesicles containing
a neurotransmitter substance called (4)
When the (5) reaches the ends of the axon, the neurotrans-
mitter is released, and it diffuses to the muscle cell membrane
to combine with receptors there. Binding of the neurotrans-
mitters with muscle membrane receptors causes the membrane
to become permeable to sodium, resulting in the influx of
sodium ions and (6) of the membrane Then contraction of
the muscle cell occurs.