What controls vital functions of the body?

Vital functions of the body are primarily controlled by the autonomic nervous system, which regulates involuntary processes such as heart rate, digestion, and respiratory rate. The brain, particularly the brainstem and hypothalamus, plays a crucial role in coordinating these functions by processing sensory information and responding accordingly. Hormonal regulation through the endocrine system also influences vital functions by releasing hormones that affect metabolism, growth, and homeostasis. Together, these systems ensure that the body's essential functions operate smoothly and respond to changes in the environment.