Explore Circulatory System MCQs – Part II with chapter-wise objective questions and answers for all competitive government exams.

🔹 Blood Pressure and Circulation

1. Systolic and diastolic pressure in a healthy man
   a. 120 mm and 80 mm
   b. 20 mm and 110 mm
   c. 90 mm and 60 mm
   d. 85 mm and 55 mm
   Answer: a
2. Blood pressure is the pressure exerted on the wall of
   a. Heart
   b. Vein
   c. Artery
   d. Cell
   Answer: c
3. In whole body mass the percentage of blood is
   a. 8%
   b. 9%
   c. 10%
   d. 11%
   Answer: a
4. Number of valves found in human heart
   a. 4
   b. 3
   c. 2
   d. 1
   Answer: a
5. Which vein brings clean blood from the lungs into the heart?
   a. Renal Vein
   b. Pulmonary Vein
   c. Vena Cava
   d. Hepatic Vein
   Answer: b
6. The scientist who explained about blood circulation for the first time was
   a. Anton Van Leeuwenhoek
   b. William Harvey
   c. Gregor Mendel
   d. Ronald Ross
   Answer: b

🔹 Blood Components and Function

7. Blood is a/an
   a. Connective tissue
   b. Epithelial tissue
   c. Both of the above
   d. None of these
   Answer: a
8. Blood fails to clot in the blood vessel because of the presence of
   a. Heparin
   b. Prothrombin
   c. Hemoglobin
   d. Hirudin
   Answer: a
9. Hemoglobin is an important component of
   a. RBC
   b. WBC
   c. Platelets
   d. Cytoplasm
   Answer: a
10. Which of the following blood cells is essential for blood coagulation?
    a. Platelets
    b. Red Blood Corpuscles
    c. White Blood Corpuscles
    d. Lymphocytes
    Answer: a
11. What are the blood corpuscles that help to build up resistance against diseases?
    a. Leucocytes
    b. Monocytes
    c. Neutrophils
    d. Lymphocytes
    Answer: a
12. Which of the following blood cell is compulsory for blood coagulation?
    a. Platelets
    b. Red Blood Corpuscles
    c. White Blood Corpuscles
    d. Lymphocytes
    Answer: a
13. Hemoglobin contains the metal
    a. Copper
    b. Molybdenum
    c. Iron
    d. Magnesium
    Answer: c
14. The life span of RBC of man is
    a. 120 days
    b. 150 days
    c. 180 days
    d. 190 days
    Answer: a
15. The normal RBC count in adult male is
    a. 5.5 million
    b. 5.0 million
    c. 4.5 million
    d. 4.0 million
    Answer: b
16. The pH of human blood is
    a. 7.2
    b. 7.8
    c. 6.6
    d. 7.4
    Answer: d
17. Volume of blood found in a healthy person
    a. 3–4 litre
    b. 4–5 litre
    c. 5–6 litre
    d. 6–7 litre
    Answer: c
18. Percentage of water found in blood plasma of human
    a. 60 to 64%
    b. 70 to 75%
    c. 80 to 82%
    d. 91 to 92%
    Answer: d

🔹 Blood Disorders and Health

19. When nitrogenous waste accumulates in the blood, which organ is not functioning?
    a. Liver
    b. Lungs
    c. Kidneys
    d. Heart
    Answer: c
20. Normal temperature of human body on the Kelvin scale is
    a. 280
    b. 290
    c. 300
    d. 310
    Answer: d
21. To which group of blood a universal recipient belongs?
    a. A group
    b. B group
    c. O group
    d. AB group
    Answer: d
22. A man whose blood group is not known meets with a serious accident. Which blood group is safest for transfusion?
    a. O, Rh−
    b. O, Rh+
    c. AB, Rh−
    d. AB, Rh+
    Answer: a

🔹 Comparative Biology

23. Which of the following are warm-blooded animals?
    a. Whales
    b. Whale sharks
    c. Alytes
    d. Draco
    Answer: a
24. Which of the following statements is not true for mammals?
    a. They possess hair on the body
    b. Some of them lay eggs
    c. Their heart is three chambered
    d. Some are aquatic
    Answer: c
25. In which vertebrate oxygenated and deoxygenated blood gets mixed?
    a. Fish
    b. Amphibian
    c. Bird
    d. Mammal
    Answer: b