One of these statements about sympathetic Nervous system is untrue

Explanation

The question is asking which of the options is not true about the sympathetic nervous system. The sympathetic nervous system is part of the autonomic nervous system that helps the body respond to stress or danger by stimulating various organs and tissues. Option A states that the sympathetic nervous system stimulates many parts of the body in times of danger, and this is true. In response to danger or stress, the sympathetic nervous system activates the fight-or-flight response, which increases heart rate, dilates pupils, and increases blood flow to muscles. Option B says that the sympathetic nervous system stimulates the heartbeat, and this is also true. The sympathetic nervous system stimulates the heart to beat faster and stronger during times of stress. Option C states that the sympathetic nervous system functions like the adrenal glands. This option is not entirely clear, but it is true that the adrenal glands release hormones in response to sympathetic nerve stimulation. Option D, which is the correct answer, states that the sympathetic nervous system lowers the blood pressure. This is not true. The sympathetic nervous system actually increases blood pressure by constricting blood vessels and increasing heart rate. In summary, the sympathetic nervous system is responsible for the body's response to stress or danger and stimulates various organs and tissues. It increases heart rate, dilates pupils, and increases blood flow to muscles. It does not lower blood pressure, but rather increases it by constricting blood vessels and increasing heart rate.