What Is Responsible for Initiating Contraction of Smooth Muscle

question 99

Multiple Choice

What is responsible for initiating contraction of smooth muscle?

• A) stimulation by motor neurons
• B) inhibition of acetylcholinesterase
• C) membrane potential drifting to threshold as a result of automatic changes in ion movement across the membrane
• D) excitation of the gap junctions by transmitter substance
• E) stimulation by the autonomic nervous system

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