View full lesson: http://ed.ted.com/lessons/how-stress-affects-your-brain-madhumita-murgia
What is stress and can it be good for you? Does it kill off your brain cells and can it cause depression? How does your brain perceive a terrifying situation and prepare your body for survival?
"Several investigators, including some in our group, have shown that pregnant compared to nonpregnant women experience a lower increase in heart rate in response to the same stressor, and cortisol increase in response to awakening is lower in pregnant women than in nonpregnant women."