Blood and Its Components
1. What is the normal pH range of blood in humans?
a) 7.0 – 7.2
b) 7.35 – 7.45
c) 7.5 – 8.0
d) 6.8 – 7.0
Answer: b) 7.35 – 7.45
2. Which component of blood helps in the clotting process?
a) Red Blood Cells
b) White Blood Cells
c) Platelets
d) Plasma
Answer: c) Platelets
3. The most abundant protein in blood plasma is:
a) Fibrinogen
b) Albumin
c) Globulin
d) Prothrombin
Answer: b) Albumin
4. Which of the following is not a formed element of blood?
a) Erythrocytes
b) Leukocytes
c) Plasma
d) Thrombocytes
Answer: c) Plasma
5. The primary function of erythrocytes is to:
a) Fight infections
b) Carry oxygen
c) Help in blood clotting
d) Transport nutrients
Answer: b) Carry oxygen
Structure and Function of the Heart
6. How many chambers are there in the human heart?
a) 2
b) 3
c) 4
d) 5
Answer: c) 4
7. The valve between the left atrium and left ventricle is known as:
a) Tricuspid valve
b) Aortic valve
c) Pulmonary valve
d) Bicuspid valve
Answer: d) Bicuspid valve
8. Which blood vessel brings oxygenated blood to the heart?
a) Pulmonary artery
b) Pulmonary vein
c) Superior vena cava
d) Inferior vena cava
Answer: b) Pulmonary vein
9. Which chamber of the heart pumps oxygenated blood to the body?
a) Right atrium
b) Right ventricle
c) Left atrium
d) Left ventricle
Answer: d) Left ventricle
10. The pacemaker of the heart is:
a) AV node
b) Purkinje fibers
c) SA node
d) Bundle of His
Answer: c) SA node
Circulation and Blood Vessels
11. Which blood vessels carry blood away from the heart?
a) Arteries
b) Veins
c) Capillaries
d) Venules
Answer: a) Arteries
12. The smallest blood vessels in the body are:
a) Arteries
b) Veins
c) Capillaries
d) Arterioles
Answer: c) Capillaries
13. Which artery carries deoxygenated blood?
a) Aorta
b) Renal artery
c) Pulmonary artery
d) Carotid artery
Answer: c) Pulmonary artery
14. Blood pressure is measured using a:
a) Thermometer
b) Sphygmomanometer
c) Barometer
d) Hydrometer
Answer: b) Sphygmomanometer
15. Normal blood pressure in adults is approximately:
a) 80/120 mmHg
b) 70/110 mmHg
c) 90/130 mmHg
d) 120/80 mmHg
Answer: d) 120/80 mmHg
Disorders and Diseases
16. Which condition is caused by high blood pressure?
a) Hemophilia
b) Hypertension
c) Leukemia
d) Thrombosis
Answer: b) Hypertension
17. An abnormal decrease in red blood cell count is termed:
a) Leukemia
b) Thrombocytopenia
c) Anemia
d) Hemophilia
Answer: c) Anemia
18. Which disease is associated with the clotting disorder of blood?
a) Anemia
b) Leukemia
c) Hemophilia
d) Hypertension
Answer: c) Hemophilia
19. Accumulation of cholesterol in arteries leads to:
a) Arthritis
b) Atherosclerosis
c) Anemia
d) Leukemia
Answer: b) Atherosclerosis
20. Varicose veins are caused due to:
a) High pressure in veins
b) Blocked arteries
c) Weak valves in veins
d) Heart enlargement
Answer: c) Weak valves in veins
Lymphatic System
21. The lymphatic system returns excess tissue fluid to the:
a) Lungs
b) Liver
c) Heart
d) Bloodstream
Answer: d) Bloodstream
22. Which of the following is a primary lymphoid organ?
a) Spleen
b) Lymph nodes
c) Tonsils
d) Thymus
Answer: d) Thymus
23. Lymph is similar in composition to:
a) Plasma
b) Red blood cells
c) Platelets
d) Serum
Answer: a) Plasma
24. The largest lymphatic organ in the body is:
a) Thymus
b) Lymph node
c) Spleen
d) Appendix
Answer: c) Spleen
25. Which organ filters blood and removes old red blood cells?
a) Liver
b) Spleen
c) Kidney
d) Lymph node
Answer: b) Spleen
Miscellaneous
26. Which of the following helps in transporting carbon dioxide in blood?
a) Platelets
b) Plasma
c) Hemoglobin
d) White blood cells
Answer: c) Hemoglobin
27. Which vitamin is necessary for blood clotting?
a) Vitamin A
b) Vitamin B12
c) Vitamin C
d) Vitamin K
Answer: d) Vitamin K
28. Which enzyme helps in the dissolution of a clot?
a) Thrombin
b) Plasmin
c) Fibrinogen
d) Prothrombin
Answer: b) Plasmin