The parasympathetic division is a part of the autonomic nervous system, which controls involuntary bodily functions. It is often referred to as the "rest and digest" system because it helps the body conserve energy and promotes relaxation. This division slows the heart rate, increases intestinal activity, and stimulates glandular secretions, allowing the body to recover and maintain homeostasis. The parasympathetic division works in opposition to the sympathetic division, which prepares the body for "fight or flight" responses. Key components of the parasympathetic division include the vagus nerve and various cranial and sacral nerves. Together, they help regulate essential functions like digestion, salivation, and urination.