I WONDER - What Job Do Veins Do?

The video explains that veins hold about 70% of the body's blood, which travels to the heart and lungs to receive oxygen. The blood in veins is deoxygenated. The largest vein is the inferior vena cava, returning blood from the lower body to the heart, while the longest is the saphenous vein in the leg. Venules are small veins that connect larger veins to capillaries.

What percentage of the body's blood is contained within the veins?

• 80%

• 70%

• 60%

• 50%

What is the primary function of veins in the circulatory system?

• To regulate body temperature

• To store nutrients

• To transport deoxygenated blood to the heart and lungs

• To carry oxygenated blood to the body

Which vein is responsible for returning blood from the lower part of the body to the heart?

• Inferior vena cava

• Superior vena cava

• Jugular vein

• Pulmonary vein

Where is the saphenous vein located?

• In the arm

• In the abdomen

• In the leg

• In the neck

What is the role of venules in the circulatory system?

• To transport oxygenated blood

• To link larger veins to capillaries

• To connect arteries to veins

• To store blood cells