Arteries vs Veins ( Circulatory System )

Arteries and veins are two types of blood vessels that carry blood throughout the body. Arteries carry blood away from the heart, while veins carry blood back to the heart.

Arteries

Arteries are thick, muscular blood vessels that have elastic walls. They are responsible for carrying oxygen-rich blood from the heart to the rest of the body. The largest artery in the body is the aorta, which carries blood from the heart to the rest of the body.

Veins

Veins are thin, flexible blood vessels that have thin walls. They are responsible for carrying oxygen-poor blood from the body back to the heart. The largest vein in the body is the vena cava, which carries blood from the lower body back to the heart.

Capillaries are tiny vessels that connect arteries and veins.

 

Differences between arteries and veins

There are several key differences between arteries and veins. These differences include:

  • Structure: Arteries are thicker and have more muscular walls than veins.
  • Blood flow: Arteries carry blood away from the heart, while veins carry blood back to the heart.
  • Blood pressure: Blood pressure is higher in arteries than in veins.
  • Oxygen content: Arteries carry oxygen-rich blood, while veins carry oxygen-poor blood.
arteries veins
systemic circulation

Pulmonary circulation is when blood travels to the lungs and back. Blood enters the right atrium from the superior and inferior vena cava. It travels to the right ventricle  and into the lungs through the pulmonary arteries. In the lungs oxygen is exchanged for carbon dioxide at tiny air sacs called alveoli and then returns to the heart through the pulmonary veins.

Systemic circulation which is circulation throughout the body. As blood returns from the lungs it enters the left atrium then travels to the right ventricle then passes out the aorta and into the rest of the body. This circulation is called systemic circulation.

The third type of circulation is called lymphatic circulation.

The lymphatic system absorbs and transports lymph. Lymph is a clear fluid that is a result of plasma leaking out of capillaries.As plasma moves out of capillaries, some of it is not reabsorbed. You lose around three liters of plasma a day. The lymphatic system reabsorbs lose fluid.
The lymphatic vessels have smooth muscle and valves that help move the lymph throughout your body.