PLEASE HELP I CAN NOT FAIL THIS TEST I REALLY NEED HELP ASAP Which of the body's systems directly tells the heart when to beat?
OA. the circulatory system
OB. the nervous system
OC. the respiratory system
OD. the digestive system

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later