Your respiratory system is made up of your lungs, airways (trachea, bronchi and bronchioles), diaphragm, voice box, throat, nose and mouth. Its main function is to breathe in oxygen and breathe out carbon dioxide. It also helps protect you from harmful particles and germs and allows you to smell and speak.

Respiratory System: Organs,…

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Most veins have valves that open and close. The valves control blood flow and keep your blood flowing in one direction. About 75% of your blood is in your veins.

Blood Vessels: Types, Anatomy, Function & Conditions

https://my.clevelandclinic.org/health/body/21640-blood-vessels

Blood vessels carry oxygen-rich blood…

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Superficial veins
Located under the skin in the fatty layer, these veins are often visible and are generally smaller than deep veins.

Deep veins
Located in the muscles and along the bones, these veins are surrounded by muscle.

Arteries are thicker and stretchier to be able to handle the higher pressure of blood moving through them. Veins are thinner and less stretchy. This structure helps veins move higher amounts of blood over a longer time than arteries.

Arteries vs. Veins: What’s the Difference?

https://www.webmd.com/heart/difference-between-arter…

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Similarities between Veins and Arteries:

Both arteries and veins are types of blood vessels that transport blood throughout the body. They are both composed of three layers: the inner endothelium, the middle smooth muscle layer, and the outer connective tissue layer.

Differences between Arteries and Veins:

Arteries
– carry oxygenated blood away from the heart.
– thicker, and walls are more muscular.

Veins
– carry deoxygenated blood back to the heart
– thinner, and walls are less muscular compared to the arteries.
– have valves to prevent blood from flowing back.