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

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.

Quizplus · Accepted Answer

This statement is false. Contractile activity of smooth muscle cells requires an increase in intracellular Ca²⁺ concentration, which can be derived from both extracellular and intracellular stores.

Which of the Following Statements Is FALSE