18 past paper MCQs on Lymphatic System, from the Circulation unit of MDCAT Biology. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.
1.The lymphatic vessels of the body empty the lymph into the blood stream at the: (MDCAT 2022)
Correct answer: (c) subclavian vein
The thoracic duct is the vessel that carries it, and it drains into the subclavian vein.
2.The final destination of lymph is the: (MDCAT 2023)
Correct answer: (c) subclavian vein
The thoracic duct returns lymph to the blood at the subclavian vein.
3.The first consequence of lymphatic blockage in tissues is: (UHS MDCAT 2025)
Correct answer: (d) Excess fluid accumulation in tissue
Lymph vessels drain the tissue fluid, so a blockage leaves it to collect in the tissue as oedema.
4.Tissue fluid in a lymphatic system is called as: (UHS MDCAT 2025)
Correct answer: (c) Lymph
Tissue fluid that has drained into the lymph vessels is called lymph.
5.What is the primary function of lymphatic vessels? (KMU MDCAT 2025)
Correct answer: (b) Drain excess interstitial fluid
Lymph vessels take back the tissue fluid the capillaries have left behind and return it to the blood.
6.Which of the following components are present both in blood and lymph? (NUMS MDCAT 2025)
Correct answer: (d) CO2, glucose and water
Lymph is tissue fluid, so it carries water, glucose and carbon dioxide but no red cells.
7.Which of the following fluid flows through the lymphatic vessels? (SIBA MDCAT 2025)
Correct answer: (b) Lymph
The lymph vessels carry lymph, the tissue fluid they have drained.
8.Which lymphatic structure absorbs dietary fats in the intestine? (SZABMU MDCAT 2025)
Correct answer: (b) Lacteals in villi
The lacteal in the centre of each villus takes up the fat as chyle.
9.Which of the following would not be compromised in the absence of lymphatic system? (NUMS MDCAT 2024)
Correct answer: (b) Oxygen carrying capacity of blood
Oxygen is carried by the red cells of the blood, which the lymphatic system has nothing to do with.
10.The presence of which molecules distinguishes blood from interstitial fluid? (NUMS MDCAT 2024)
Correct answer: (d) RBCs and large proteins
Red cells and the plasma proteins stay in the vessel; the rest of the plasma filters out as tissue fluid.
11.The lymphatic vessels of the body empty the lymph into blood stream at ? (UHS MDCAT 2023)
Correct answer: (c) Subclavian vein
The thoracic duct empties the lymph into the left subclavian vein.
12.Lymphatic system contains all of the following organs / structures except: (SZABMU MDCAT 2023)
Correct answer: (d) Lungs
The lungs belong to the respiratory system; the lymphatic system is vessels, nodes, spleen and thymus.
13.The final destination of lymph is: (UHS MDCAT 2023)
Correct answer: (d) Subclavian vein
The thoracic duct empties the lymph into the subclavian vein.
14.Lacteals within the villi of the small intestine are a type of: (PMC MDCAT 2022)
Correct answer: (c) Lymph capillaries
A lacteal is the lymph capillary at the centre of a villus, which takes up the fat.
15.Where do lymph capillaries end blindly? (PMC MDCAT 2022)
Correct answer: (b) Tissues
The lymph capillaries begin blindly among the cells of the tissues.
16.Backflow of lymph is prevented by : (PMC MDCAT 2022)
Correct answer: (b) Valves
Valves in the lymph vessels let the lymph pass one way only.
17.Which of the following vessels have larger intercellular spaces in their walls? (PMC MDCAT 2022)
Correct answer: (a) Lymph vessels
The wide gaps between the cells of a lymph capillary let proteins and cell debris in.
18.lymph vessels deposit the lymph into: (PMC MDCAT 2022)
Correct answer: (b) Veins
The lymph is returned to the blood through the great veins at the root of the neck.