Question

Select all the features that veins have to assist with returning blood to the heart under low pressure.

a.elastic fibers in all tunica for recoil
b.located between skeletal muscles
c.thick tunica externa
d.larger oval opening
e.valves in the tunica intima
f.thick tunica media for vasocontraction

Answer 1

Veins have elastic fibers for recoil, are located between skeletal muscles, and have valves in the tunica intima to assist with returning blood to the heart under low pressure. Options a, b and e are correct.

Step-by-step explanation:

Veins have several features that assist with returning blood to the heart under low pressure:

1. Elastic fibers in all tunica for recoil: The elastic fibers in the tunica media of veins allow the walls of the veins to stretch and then recoil, aiding in the movement of blood.
2. Located between skeletal muscles: Veins are often located between skeletal muscles, which contract during movement and help push blood towards the heart.
3. Valves in the tunica intima: Veins have valves in their tunica intima that prevent the backflow of blood and assist in the return of blood to the heart.