The atrioventricular valves seal by the surfaces of the flaps coming together- the edges of the flaps do not scrape against each other or against the walls of the
ventricles. Why is this frictionless way of closing, which doesn't cause any wear on
the valves, important?

In which way does nicotine cause addiction? by stimulating the brain's pleasure center by increasing blood-sugar levels by decreasing dopamine levels by reducing depression and anxiety

Exercise has no positive effects on the nervous system? true or falseu

Hi! i’m not sure if i’m right can someone : ) deborah is attempting to understand her personality type and preferences in order to decide on her future profession. which personality assessment is most likely to give her the information she desires? a. big five test b. myers-briggs type indicator (mbt) [i think it’s this one not sure] c. thematic apperception test (tat) d. minnesota multiphasic personality imventory (mmpi-2)