The largest artery in the human body is:
a) Pulmonary artery
b) Aorta
c) Carotid artery
d) Subclavian artery
Answer: b) Aorta
2. Blood pressure is measured by:
a) Thermometer
b) Stethoscope
c) Sphygmomanometer
d) ECG
Answer: c) Sphygmomanometer
3. Which blood component helps in the clotting of blood?
a) RBC
b) WBC
c) Platelets
d) Plasma
Answer: c) Platelets
4. Which of the following carries oxygen-rich blood?
a) Pulmonary vein
b) Pulmonary artery
c) Vena cava
d) Right atrium
Answer: a) Pulmonary vein
5. Normal blood pressure in a healthy adult is:
a) 80/120 mm Hg
b) 120/80 mm Hg
c) 130/90 mm Hg
d) 100/70 mm Hg
Answer: b) 120/80 mm Hg
6. Which chamber of the heart receives deoxygenated blood from the body?
a) Left atrium
b) Right atrium
c) Left ventricle
d) Right ventricle
Answer: b) Right atrium
7. Which organ is primarily responsible for filtering blood?
a) Heart
b) Lungs
c) Kidneys
d) Liver
Answer: c) Kidneys
8. Which blood group is known as the universal donor?
a) A
b) AB
c) O
d) B
Answer: c) O
9. The heart is made up of:
a) Skeletal muscle
b) Smooth muscle
c) Cardiac muscle
d) Voluntary muscle
Answer: c) Cardiac muscle
10. The oxygen-carrying pigment in red blood cells is:
a) Haemoglobin
b) Myoglobin
c) Melanin
d) Chlorophyll
Answer: a) Haemoglobin
11. Pulmonary circulation involves the movement of blood between:
a) Heart and body
b) Heart and lungs
c) Lungs and body
d) Heart chambers
Answer: b) Heart and lungs
12. Which vein carries oxygenated blood?
a) Pulmonary artery
b) Superior vena cava
c) Inferior vena cava
d) Pulmonary vein
Answer: d) Pulmonary vein
13. The main function of white blood cells is:
a) Oxygen transport
b) Blood clotting
c) Fighting infection
d) Hormone transport
Answer: c) Fighting infection
14. Arteries carry blood:
a) Away from the heart
b) Toward the heart
c) In and out of the heart
d) Within the lungs only
Answer: a) Away from the heart
15. What prevents the backflow of blood in veins?
a) Thick walls
b) High pressure
c) Valves
d) Smooth muscle
Answer: c) Valves
16. What is the function of capillaries?
a) Pump blood
b) Oxygenate blood
c) Exchange of gases and nutrients
d) Filter waste
Answer: c) Exchange of gases and nutrients
17. Which blood cells are responsible for clotting?
a) Lymphocytes
b) Platelets
c) Neutrophils
d) Erythrocytes
Answer: b) Platelets
18. Which part of the heart has the thickest wall?
a) Right atrium
b) Left atrium
c) Right ventricle
d) Left ventricle
Answer: d) Left ventricle
19. Which part of blood helps in the transport of nutrients, hormones, and waste?
a) RBC
b) Plasma
c) Platelets
d) WBC
Answer: b) Plasma
20. SA node in the heart is also known as:
a) Atrioventricular node
b) Bundle of His
c) Pacemaker
d) Purkinje fibers
Answer: c) Pacemaker