Blood Flow and Circulatory System Quiz

What do arteries do in the circulatory system?

• Carry blood to the heart

• Carry blood away from the heart

• Exchange gases with tissues

• Store blood for emergencies

What is the primary function of arteries?

• To filter blood

• To carry blood away from the heart

• To store nutrients

• To produce blood cells

Where does the exchange of gases and nutrients primarily occur?

• Arteries

• Veins

• Capillaries

• Arterioles

Which layer of the blood vessel wall is in direct contact with the blood?

• Tunica externa

• Tunica media

• Tunica intima

• Tunica adventitia

What happens when the endothelium is damaged?

• It leads to vasodilation

• It exposes collagen fibers, leading to clot formation

• It causes the release of histamines

• It results in increased blood flow

What role does smooth muscle play in arterioles?

• It is fully relaxed to allow maximum blood flow

• It is slightly contracted to maintain vascular tone

• It is absent in arterioles

• It is fully contracted to stop blood flow

What is the significance of fenestrations in capillaries?

• They provide structural support

• They allow for rapid exchange of substances

• They prevent blood flow

• They store nutrients

Which type of capillaries is the most common?

• Continuous capillaries

• Fenestrated capillaries

• Sinusoid(al) capillaries

• Discontinuous capillaries

What regulates the flow of blood into capillary beds?

• Heart valves

• Precapillary sphincters

• Blood vessels

• Red blood cells

Diagram showing the structure of veins, including large vein, medium-sized vein, and venule with labels for tunica externa, tunica media, tunica intima, valves, vasa vasorum, and nervi vasorum.

• The diagram includes labels for tunica externa, tunica media, tunica intima, valves, vasa vasorum, and nervi vasorum.

• The diagram includes labels for tunica externa, tunica media, tunica intima, valves, vasa vasorum, and capillaries.

• The diagram includes labels for tunica externa, tunica media, tunica intima, valves, vasa vasorum, and lymph nodes.

• The diagram includes labels for tunica externa, tunica media, tunica intima, valves, vasa vasorum, and arteries.