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The iris' radial muscle causes the pupils to enlarge. Which ANS branch therefore regulates the radial muscles? the sympathetic nervous system
A network of neurons in your body called the sympathetic nervous system aids in the "fight-or-flight" reaction. When you're under stress, in danger, or engaged in physical exercise, this system becomes more active.
Your autonomic nervous system includes your sympathetic nervous system. It might be referred to as your "automatic" nervous system because it controls a variety of processes that don't require conscious thought. Among other things, this can include managing your heart rate, blood pressure, digestion, urination, and perspiration.
The ability of your sympathetic nervous system to react to risky or stressful conditions is its most well-known function. When this happens, your sympathetic nervous system kicks in to help you escape danger by increasing your heart rate, pumping more blood to areas of your body that need it, and other responses.
Learn more about sympathetic nervous system is visit here;
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