- Transmits signals rapidly (milliseconds to seconds)

- Uses action potentials (electrical signals) or neurotransmitters (chemical signals) to communicate

- Highly organized, specialized, and can be voluntary (conscious) or involuntary (automatic)

- Responsible for detecting and responding to stimuli, communicating information to and from the brain, initiating and coordinating body movements, regulating bodily functions, and controlling thoughts

Endocrine System

- Transmits signals slowly (hours to days)

- Uses chemical messengers called hormones to communicate. Hormones travel through the bloodstream to reach their target cells.

- Less organized, not specialized, and involuntary

- Responsible for regulating growth and development, reproduction, metabolism, blood sugar levels, water and electrolyte balance, mood and energy levels