Question at position 63 All of the following are true concerning innervation of the GI tract, except:Peristalsis is the mechanism that propels the food mass through the GI system.Individuals have control over the functions of the autonomic nervous system.The autonomic nervous system controls digestion.Peristalsis is controlled by the parasympathetic system.

Question

BlackTom AI · Accepted Answer

The question asks which statement about GI innervation is not true, so I will evaluate each option in turn before highlighting the problematic one.

Option 1: 'Peristalsis is the mechanism that propels the food mass through the GI system.' This is accurate. Peristalsis is a coordinated wave of smooth muscle contractions that moves contents along the GI tract, a fundamental aspect of GI motility.

Option 2: 'Individuals have control over the functions of the autonomic nervous system.' This statement is incorrect. The autonomic nervous system (ANS) regulates involuntary functions such as heart rate, digestion, and glandular activity. While we can influence our physiology indirectly through behavior (e.g., stress reduction), we do not exert direct voluntary control over the core processes governed by the ANS.

Option 3: 'The autonomic nervous system controls digestion.' This is true. The ANS modulates digestive processes, including motility, secretion, and blood flow to the gut, often via its parasympathetic and sympathetic branches.

Option 4: 'Peristalsis is controlled by the parasympathetic system.' This is broadly correct in that the parasympathetic division generally promotes GI motility and peristaltic activity, though the enteric nervous system also plays a key local role.

In summary, the only statement that is not true is Option 2, which claims direct voluntary control over autonomic functions; the others describe established aspects of GI innervation and motility.

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The largest number of parasympathetic nervous system fibers are contained in which area of the body?

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The autonomic nervous system:

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The autonomic nervous system controls involuntary visceral activities in the body.

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