Regarding orientation of spiral arteries, which of the following is true
Spiral arteries are perpendicular and veins are parallel to uterine wall. This aids in closure of veins during a uterine contraction and prevents exit of maternal blood from intervillous space.
Both arteries and veins are perpendicular to the uterine wall
Both arteries and veins are parallel to the uterine wall
Arteries are perpendicular and veins are parallel to the uterine wall
Veins are perpendicular and arteries are parallel to the uterine wall