AP PSYCHOLOGY

Detailed explanation-1: -To date, scientists have identified more than 60 distinct types of neurotransmitters in the human brain, and most experts say there are more left to discover.

Detailed explanation-2: -Answer and Explanation: The best answer is C. They move in a random manner. Neurotransmitters are chemical messenger substances.

Detailed explanation-3: -Neurotransmitters are important in boosting and balancing signals in the brain and for keeping the brain functioning. They help manage automatic responses such as breathing and heart rate, but they also have psychological functions such as learning, managing mood, fear, pleasure, and happiness.

Detailed explanation-4: -Neurotransmitters are chemical messengers that your body can’t function without. Their job is to carry chemical signals (“messages”) from one neuron (nerve cell) to the next target cell. The next target cell can be another nerve cell, a muscle cell or a gland.