The diagram shows the blood vessels associated with the liver.
What are the blood vessels labelled X, Y and Z?
▶️ Answer/Explanation
Ans: C
X is the hepatic vein (carries blood from liver to heart), Y is the hepatic artery (oxygenated blood from aorta), and Z is the hepatic portal vein (nutrient-rich blood from intestines). Option C matches this order. The key is noting the direction of blood flow in the diagram.
Which row shows the features of a blood vessel that transports blood at low pressure?
▶️ Answer/Explanation
Ans: D
Veins transport blood at low pressure and have thin walls (less muscle/elastic tissue) and valves to prevent backflow. These features match Row D.
Arteries (high pressure) have thick walls (A/B), while capillaries (C) lack valves and have minimal wall thickness. Thus, D is the correct representation of a low-pressure vessel (vein).