Blood vessels consists of artery, vein and ____

As compared to artery, a vein has

As compared to artery, a vein has

__________ are the fine blood vessels connecting arteries with veins.

Which blood vessel, a vein or an artery, carries a hormone from an endocrine gland.

Which blood vessel, a vein or an artery, carries a hormone from an endocrine glands?

You can see some blood vessels on the outside of the hands specially in older people. Are those veins or arteries? How can you confirm your answer?

In human kidney, the blood vessel which is not a portal vein but starts with blood capillaries and end with blood capillaries is

In human kidney, the blood vessel which is not a portal vein but starts with blood capillaries and end with blood capillaries is