What is the main function of your respiratory system?

The main function of your respiratory system is to pull in oxygen for your body’s cells and get rid of carbon dioxide, a waste product. You do this by breathing in and out and through gas exchange between the small air sacs of your lungs (alveoli) and the blood vessels running nearby.…[Read more]

*Do veins have valves?*

Veins, unlike arteries, have valves that ensure blood only travels in one way. Arteries don’t need valves since the heart’s pressure is so high that blood can only flow in one way. Valves also assist blood is returning to the heart against gravity.

Most veins have valves that open and close. The valves control blood flow…[Read more]

*What are the two types of veins?*

1. pulmonary veins

2. systemic veins

Pulmonary veins. The pulmonary circuit carries deoxygenated blood from your heart to your lungs. Once your lungs oxygenate the blood, the pulmonary circuit brings it back to your heart. There are four pulmonary veins. They’re unique because they carry oxygenated blood.…[Read more]

*Are veins bigger than arteries?*
No. Veins are not bigger than arteries. The walls of veins have the same three layers as the arteries. Although all the layers are present, there is less smooth muscle and connective tissue. This makes the walls of veins thinner than those of arteries, which is related to the fact that blood in the veins has l…[Read more]