The oldest and most primitive of the brain's structures are the cerebral hemispheres

How are the stress response and immune systems related?

a. illness is a cause of stress, but not the other way around b. the two systems are physiologically separate, but by coincidence are sometimes activated at the same time c. they are both controlled by the same brain regions d. increased stress levels directly impact the functioning of the immune system

According to the concept of facial feedback, when Noah complies with instructions to smile and look happy, it is most likely that:

a. he will be unaffected because he is just pretending to be happy. b. he will begin to feel angry. c. his positive feelings will increase. d. his reaction will depend on his age.