17 past paper MCQs on Blood Vessels, 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 descending aorta bifurcates into two vessels which on further division form the femoral artery that supplies blood to the muscles of the legs. These two vessels are the: (MDCAT 2023)
Correct answer: (b) iliac arteries
The aorta ends by dividing into the two common iliac arteries.
2.Which of the following blood vessels have lowest blood velocity with correct reason for low blood velocity? (UHS MDCAT 2025)
Correct answer: (b) Capillaries: due to highest overall cross-sectional area
The capillary bed has by far the largest total cross-section, and flow is slowest where the section is greatest.
3.Blood flow in vessels least depends on: (NUMS MDCAT 2025)
Correct answer: (c) Skeletal muscle contraction
Muscle contraction helps the venous return, but the flow itself is set by the heart, the pressure and the vessel bore.
4.Which structural characteristic is most accurate for arteries? (SIBA MDCAT 2025)
Correct answer: (b) Thick and muscular walls
An artery meets the full pressure of each heartbeat, so its wall is thick, muscular and elastic.
5.Which of the following set of characteristics are related to veins? (NUMS MDCAT 2024)
Correct answer: (c) Valves: Present, Wall thickness: Thinner, Diameter: 40-50mm
A vein has a wide bore, a thin wall and valves to stop the blood falling back.
6.Flow of blood in the capillaries is adjusted by? (UHS MDCAT 2023)
Correct answer: (b) Pre-capillary sphincters
A ring of muscle at the mouth of each capillary bed opens or closes it as the tissue needs.
7.Mesenteric veins drain the blood from: (NUMS MDCAT 2023)
Correct answer: (b) Large intestine
The mesenteric veins drain the intestine and join to form the hepatic portal vein.
8.Descending aorta is bifurcated into two vessels which on further division from femoral artery that supply blood to high muscles of legs: (UHS MDCAT 2023)
Correct answer: (b) iliac artery
The descending aorta divides into the two iliac arteries, which become the femoral arteries of the legs.
9.The medium through which exchange of material between blood and cells occurs is (PMC MDCAT 2022)
Correct answer: (a) Interstitial fluid
Everything passing between blood and cell crosses the interstitial, or tissue, fluid.
10.Vena-Cava receives deoxygenated blood of kidney through : (PMC MDCAT 2022)
Correct answer: (b) Renal vein
The renal vein carries the blood of the kidney into the inferior vena cava.
11.Iliac vein from the lower limb’s unite to form: (PMC MDCAT 2022)
Correct answer: (a) Vena cava
The two iliac veins join to form the inferior vena cava.
12.Which of the following blood vessels have the highest pressure of blood? (PMC MDCAT 2020)
Correct answer: (a) Aorta
The aorta takes the full force of the left ventricle, so the pressure there is highest.
13.The only vein in human carrying oxygenated blood is: (PMC MDCAT 2020)
Correct answer: (b) Pulmonary
The pulmonary vein brings oxygenated blood back from the lungs.
14.Which of the following blood vessels contain semilunar valves? (UHS MDCAT 2019)
Correct answer: (c) Veins
Veins carry semilunar valves that stop the blood falling back.
15.The major function of basophils is to: (UHS MDCAT 2019)
Correct answer: (b) Release heparin to prevent blood clotting
Basophils release heparin, which keeps the blood from clotting, and histamine.
16.Which one of the following cells does not have nucleus: (UHS MDCAT 2018)
Correct answer: (d) Platelets
Platelets are fragments of megakaryocytes and carry no nucleus.
17.Among the following, identify the agranulocytes: (UHS MDCAT 2017)
Correct answer: (c) Monocytes
Monocytes and lymphocytes have no granules, so they are agranulocytes.