One-way vessels that carry blood back to the heart are known as what?
or:One-way vessels that carry blood back to the heart are known as what?or:Veins.
or:One-way vessels that carry blood back to the heart are known as what?
or:Veins.
Tags:heart,
or:One-way vessels that carry blood back to the heart are known as what?
or:Veins.
Tags:heart,