Similarities
Both function in assisting your heart by delivering and circulating blood, which helps transfer oxygen and other minerals, and bringing back deoxygenated blood. Both supply nutrients, hormones, and provide nourishment to the body, it also helps fight diseases and maintain body temperature.
The differences in the walls of arteries and veins
There are differences between the thickness of the walls of the arteries and the veins that relates to their function, whereas the arteries are thicker, and much stretchier than the veins, which allows it to handle higher pressures of blood that are flowing into them, and the veins having thinner, and less stretchy walls that allows them to carry higher amounts of blood than the arteries over a longer period of time.
What are the two types of veins?
There are two types of veins that can be found in the body, which are determined based on the circuit they are found in, they are the 1) Pulmonary veins and 2) Systematic veins. Pulmonary veins transports deoxygenated blood from the heart to the lungs, oxygenates it, and returns it to the heart through four unique veins, while the Systematic veins transports deoxygenated blood from the body to the heart, where it enters the pulmonary circuit for oxygen, with most veins being systemic veins.
Do veins have valves?
The majority of our veins have valves, wherein they open and close. Our veins contain almost 75% of your blood, so its function is directly related to it as it helps regulate blood flow and maintain unidirectional blood flow.