Respiratory system | Canadian Lung Association

https://www.lung.ca/lung-health/lung-info/respiratory-system

This chart of the RESPIRATORY SYSTEM shows how you breathe.  Breathing is the process that brings  oxygen in the air into your lungs and moves oxygen and through your body. Our lungs remove the oxygen and pass it t…

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Do veins have valves?

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.

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

What are the 2 types of veins?
Pulmonary veins. The -pulmonary circuit carries deoxygenated blood from your heart to your lungs. …
Systemic veins. The -systemic circuit carries deoxygenated blood from the rest of the body back to your heart, where it then enters the pulmonary circuit for oxygen.

R: https://www.healthline.com/health/venous-system

Why are veins thinner than arteries?

Veins have much thinner walls than do arteries, largely because the pressure in veins is so much lower. Veins can widen (dilate) as the amount of fluid in them increases.

R: https://www.msdmanuals.com/home/heart-and-blood-vessel-disorders/biology-of-the-heart-and-blood-vessels/biology-of-the-blood-vessels

Are veins bigger than arteries?

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

R: https://www.webmd.com/heart/difference-between-arteries-and-veins

Differences Between Arteries and Veins
Following are the major differences between arteries and veins:

Functions
Arteries- Involved in carrying oxygenated blood except for pulmonary arteries

Veins- Involved in carrying deoxygenated blood except for pulmonary veins

The direction of Blood Flow
Arteries- In the downward direction from the heart…[Read more]