As lisa drove home, she was suddenly alerted to the sound of a blaring horn and realized she had drifted off to sleep. which nervous system division dominated when she was startled awake? a) sensory nervous system
b) sympathetic nervous system
c) parasympathetic nervous system
d) somatic nervous system

B) sympathetic nervous system

Explanation:

The sympathetic nervous system controls the way the body quick involuntary response to harmful or stressful situations. A rush in hormones rapidly occur to quicken the body's alertness and heart rate to release extra blood to the muscles

It's route of Expression starts with the amygdala sending a distress signal to the hypothalamus which sends activation signals to the sympathetic nervous system via the autonomic nerves to the adrenal glands which help pump the hormone epinephrine (also known as adrenaline) into the bloodstream.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.