Acetylcholine (ach) affects muscle action, learning, and memory. endorphins are natural opiates released in response to pain and exercise. drugs and other chemicals affect brain chemistry at synapses. agonists increase a neurotransmitter's action, and may do so in various ways. antagonists decrease a neurotransmitter's action by blocking production or release.

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

In "the man in the water," what was the remarkable occurrence that rosenblatt reported?

What is the importance of having the us forest service, the bureau of land management, the us fish and wildlife service, and the national park service? to manage land resources for conservation and the development of natural resources to manage land resources for conservation and the development of urban areas to preserve historical landmarks and manage the development of urban areas to preserve historical landmarks and manage the development of rural areas