What are neurotransmitters?
Neurotransmitters are chemical messengers in the body. Their job is to transmit signals from nerve cells to target cells. These target cells may be in muscles, glands, or other nerves. The brain needs neurotransmitters to regulate many necessary functions, including: heart rate breathing sleep cycles digestion mood concentration appetite muscle movement The nervous system controls the body’s organs, psychological functions, and physical functions. Nerve cells, also known as n