15. Which option about the sympathetic system is incorrect? A. It is the larger of the two divisions constituting the autonomic system and is distributed throughout the entire body. B. The function of the sympathetic system is to prepare the body for an emergency. C. Heart rate increases, skin and intestinal blood vessels constrict, skeletal muscle blood vessels dilate, and blood pressure increases. D. Jood is redistributed diverting it away from the brain, heart, and skeletal muscles, and owards the skin and digestive system. __ E. Sympathetic nerves dilate the pupils, inhibit the smooth muscles o of the bronchi and intestines and close sphincters.

## Step 1<br />The sympathetic nervous system is a part of the autonomic nervous system, which is responsible for involuntary body functions. It is often referred to as the "fight or flight" system because it prepares the body for stressful or emergency situations.<br /><br />## Step 2<br />Option A states that the sympathetic system is the larger of the two divisions constituting the autonomic system and is distributed throughout the entire body. This is incorrect. The sympathetic nervous system is actually the smaller of the two divisions of the autonomic nervous system, with the parasympathetic nervous system being the larger.<br /><br />## Step 3<br />Option B correctly states that the function of the sympathetic system is to prepare the body for an emergency. This is true, as the sympathetic nervous system is responsible for the body's "fight or flight" response.<br /><br />## Step 4<br />Option C describes several physiological changes that occur during the activation of the sympathetic nervous system, such as an increase in heart rate, constriction of skin and intestinal blood vessels, dilation of skeletal muscle blood vessels, and an increase in blood pressure. These are all correct responses of the sympathetic nervous system.<br /><br />## Step 5<br />Option D states that blood is redistributed away from the brain, heart, and skeletal muscles towards the skin and digestive system during the activation of the sympathetic nervous system. This is also correct, as the sympathetic nervous system prioritizes the skin and digestive system during emergency situations.<br /><br />## Step 6<br />Option E correctly states that the sympathetic nervous system dilates the pupils, inhibits the smooth muscles of the bronchi and intestines, and closes the sphincters. These are all correct responses of the sympathetic nervous system.