Was ist eine Vene?

The video explains the role and structure of veins within the cardiovascular system. It begins by defining what makes a vein distinct, then provides an overview of the cardiovascular system, detailing how blood flows from the heart through arteries to capillaries and back via veins. The function and structure of veins are discussed, highlighting their thin walls, larger lumen, and the presence of valves to prevent backflow. The interaction between capillaries and veins is also covered, emphasizing the exchange of gases, nutrients, and metabolic products.

What is the primary function of the aorta in the cardiovascular system?

• To carry oxygen-rich blood from the heart to the body

• To transport oxygen-poor blood to the lungs

• To collect blood from the veins

• To exchange gases and nutrients in tissues

Which of the following is a characteristic of veins?

• Thick walls and high pressure

• Thin walls and low pressure

• No valves and small lumen

• Direct connection to the aorta

What is the role of valves in veins?

• To increase blood pressure

• To prevent blood from flowing backward

• To exchange oxygen and nutrients

• To connect arteries and veins

Where does the exchange of gases and nutrients primarily occur in the cardiovascular system?

• In the capillaries

• In the aorta

• In the veins

• In the left ventricle

What happens to blood after it releases oxygen and nutrients in the tissues?

• It remains in the capillaries

• It collects in venules and forms veins

• It is expelled from the body

• It is absorbed by the arteries