Each skeletal muscle fiber is controlled by a motor neuron at a single
A) synaptic knob.
B) sarcomere.
C) neuromuscular junction.
D) synaptic cleft.
E) transverse tubule.
Question 2
In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulum releases
A) acetylcholine.
B) sodium ions.
C) potassium ions.
D) calcium ions.
E) hydrogen ions.