Free Blood Vessels MCQs with Answers
71 Blood Vessels MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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- A. Heart directly
- B. Pre-capillary sphincters
- C. Meta-arterioles
- D. Valves
Explanation: The flow of blood in the capillaries is primarily adjusted by pre-capillary sphincters, which regulate the entry of blood into the…
Correct answer: Pre-capillary sphincters- A. iliac vein
- B. iliac artery
- C. temporal artery
- D. Sciatic artery
Explanation: The descending aorta is bifurcated into two vessels called the common iliac arteries (Option B).
Correct answer: iliac artery- A. Gallbladder
- B. Liver
- C. Kidneys
- D. Lungs
Explanation: Fibrinogen is a protein produced by the liver, which plays a crucial role in blood clotting by being converted into fibrin during the…
Correct answer: Liver- A. Liver
- B. Spleen
- C. Bone marrow
- D. Heart
Explanation: Blood cells are produced in the red bone marrow from hematopoietic stem cells.
Correct answer: Bone marrow- A. Leukaemia
- B. Polycythemia
- C. Edema
- D. Anemia
Explanation: Polycythemia is characterized by an abnormally high concentration of red blood cells in the bloodstream.
Correct answer: Polycythemia- A. Group A to Group B
- B. Group AB to Group O
- C. Group A to Group O
- D. Group B to Group AB
Explanation: Blood transfusions must be compatible, meaning donor blood antigens should not react with recipient blood antibodies.
Correct answer: Group B to Group AB- A. 5 microns
- B. 6 microns
- C. 7 microns
- D. 8 microns
Explanation: The correct answer is 8 microns. Human capillaries typically have a diameter of about 8 to 10 microns, which is just enough to allow red…
Correct answer: 8 microns- A. 850mm/minute
- B. 900mm/minute
- C. 750mm/minute
- D. 730mm/minute
Explanation: Cerebral circulation refers to the flow of blood through the network of blood vessels supplying the brain.
Correct answer: 750mm/minute- A. 1500 ml
- B. 1600 ml
- C. 1800 ml
- D. 1900 ml
Explanation: Skin blood flow plays a major role in the distribution of thermal energy during exercise.
Correct answer: 1900 ml- A. Arteriosclerosis
- B. Atherosclerosis
- C. Thrombosis
- D. Embolism
Explanation: Atherosclerosis is a condition that specifically involves the buildup of cholesterol and plaque on the artery walls, leading to thickening…
Correct answer: Atherosclerosis- A. Vasa vasorum
- B. Tunica media
- C. Tunica externa
- D. Tunica interna
Explanation: Vasa vasorum is a network of small blood vessels that supply oxygen and nutrients to the walls of larger blood vessels, such as arteries…
Correct answer: Vasa vasorum