Question

Muscles of alimentary canal are chiefly _______________.

• A. Striated and Neurogenic
• B. Unstriated and Neurogenic
• C. Striated and Myogenic
• D. Unstriated and Myogenic

Answer 1

Answer: (D)

• The alimentary canal is made up of smooth muscles which are involuntary and controlled by the autonomic nervous system.
• Single-unit smooth muscles are present in the alimentary canal and they can contract regularly without input from a motor neuron (myogenic) as opposed to multi-unit smooth muscle, which is neurogenic - that is, its contraction must be initiated by an autonomic nervous system neuron (neurogenic).
  
• Hence, muscles of the alimentary canal are chiefly unstriated and myogenic.

So the correct answer is option D.