What is the tension exerted by blood against the arterial walls as the heart alternately contracts and relaxes?

Which of the following neurotransmitters has been found to be blocked by the "newer" atypical antipsychotic agents?

a. acetylcholine b. epinephrine c. serotonin d. norepinephrine

Worldwide, the highest rates for teenage pregnancies occur in ____________________.

Fill in the blank(s) with the appropriate word(s).