MEDICAL PHYSIOLOGY

Detailed explanation-1: -Billions of neurotransmitter molecules constantly work to keep our brains functioning, managing everything from breathing to heartbeat to learning and concentration levels. They can also affect various psychological functions such as fear, mood, pleasure, and joy.

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 themselves affected by agonists which amplify their effect and antagonists which reduce their effect. As a result, neurons working together can produce a large variety of effects resulting in a complex repertoire of behaviours.

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.