Substances or drugs that activate receptors
Substances or drugs that attach to receptors and prevent them from being activated
The CNS receives information from PNS, evaluates information, then regulates muscle and organ activity via PNS
Receives input from all the sensory systems and cerebral cortex
Controls the brain’s state of arousal (sleep vs. awake)
The cerebral cortex
Go to the brain and spinal cord
Conveys sensory info (pain, pressure, temperature)
Somatic (control of voluntary muscles)
Autonomic (control of unconscious functions)
Which 2 systems work in an antagonistic fashion to control unconscious, visceral functions such as breathing and cardiovascular activity?
Sympathetic and parasympathetic systems
secreting glands (e.g., adrenal, thyroid, pituitary)
bloodstream and carried by the blood to all the organs and tissues of the body.
Produce growth of muscle mass
Increase body weight