Which of the following statements is FALSE?
A. Ca2+ that activates contraction of smooth muscles can come from either the ECF or from the sarcoplasmic reticulum.
B. In the absence of any neural input, skeletal muscle cannot generate tension.
C. A single smooth muscle cell may be innervated by both a sympathetic neuron and a parasympathetic neuron.
D. Synaptic input onto skeletal muscle cells is always excitatory, whereas inputs to smooth muscle cells may be either excitatory or inhibitory.
E. Contractile activity of smooth muscle cells does not normally require Ca2+.
Answer: E
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