Innocent people may react to the polygraph because they are nervous about the procedure

During a geriatrics conference, discussion was focused on age-related changes to brain size and cognitive functioning. Which of the following summaries is most accurate for this discussion?

a) The brain will remain the same size, and cognitive function can remain the same if the person keeps active. b) Brain structure and cognition will decline slightly. c) Brain structure will be drastically reduced, and cognitive functioning will decrease. d) The brain becomes smaller and lighter with age, and brain cells begin to decline.

Which effect would be considered to be agonistic?

a. blocking the synthesis of neurotransmitters b. stimulating the release of neurotransmitters c. blocking the postsynaptic receptors d. mimicking enzymes that breakdown neurotransmitters