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

Question

Quizplus · Accepted Answer

The statement that contractile activity of smooth muscle cells does not normally require Ca2+ is false. In fact, Ca2+ is required for smooth muscle contraction, as it is in skeletal muscle cells.

Which of the Following Statements Is FALSE