Do veins have valve?
Many veins, particularly those in the arms and legs, have one-way valves. Each valve consists of two flaps (cusps or leaflets) with edges that meet. Blood flowing toward the heart pushes the flaps open like a pair of one-way swinging doors.

Overview of the Venous System – Overview of the Venous System – MSD…

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What are the two types of veins?
Pulmonary veins. Pulmonary veins are major blood channels that transport oxygenated blood from the lungs to the rest of the body. There are four pulmonary veins in total, two from each lung, left and right, that drain into the heart’s left atrium.
Systemic veins. The systemic circuit transports deoxygenated b…[Read more]

Why are arteries thicker than veins?
Arteries are thicker than veins because they carry oxygenated blood away from the heart at a higher pressure and need to withstand that pressure.

Arteries vs. Veins: What’s the Difference?

https://www.webmd.com/heart/difference-between-arteries-and-veins#:~:text=Your%20arteries%20are%20thi…

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Why are veins thinner than arteries?
Veins have thinner walls than arteries because veins carry blood at a lower pressure and don’t need to be as strong to handle the pressure.

Biology of the Blood Vessels – Biology of the Blood Vessels – MSD Manual Consumer…

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Similarities
Arteries and veins are key parts of the circulatory system, which delivers oxygen-rich blood to the body and returns oxygen-poor blood for purification. In addition to circulating blood, they provide nutrients, hormones, and help regulate body temperature and fight illness.
Blood circulation transports oxygen to organs and removes…[Read more]