Which of the following is true
Select one:
a. Vasomotor syncope may occur when you lie down after standingup for a long time
b. Vasomotor syncope is caused by increased venous return, whichcauses excessive stimulation of the baroreceptor reflex
c. Vasovagal syncope occurs in response to a disturbingsituation that causes over-stimulation of the SNS
d. Contraction of the lower leg muscles helps to preventvasomotor syncope because it increases the pressure gradient fromthe peripheral veins to the right atrium
