according to the myogenic regulation of glomerular filtration rate, an increase in blood pressure that stretches the afferent arterioles of the kidneys and causes a high gfr is countered by: a. vasoconstriction of the afferent arterioles to bring gfr back down to normal b. vasodilation of the afferent arteriole to keep gfr above normal c. vasoconstriction of the afferent arterioles to keep gfr above normal d. vasodilation of the afferent arterioles to bring gfr back down to normal
