Anatomical systems are groups of organs and structures that work together to perform specific functions in the body. These systems include the circulatory system, which transports blood and nutrients; the respiratory system, responsible for breathing; and the digestive system, which processes food. Each system plays a vital role in maintaining overall health and homeostasis. Other important anatomical systems include the nervous system, which controls body functions through signals; the musculoskeletal system, providing support and movement; and the endocrine system, which regulates hormones. Understanding these systems helps in studying human anatomy and physiology.