MCQ 21:
What is the average volume of blood in an adult human body?
A) 2-4 liters
B) 4-6 liters
C) 6-8 liters
D) 8-10 liters
Answer: B) 4-6 liters
Explanation: The average adult has approximately 4-6 liters of blood in their body, depending on size and gender.
MCQ 22:
Which type of white blood cell is primarily responsible for fighting viral infections?
A) Neutrophils
B) Lymphocytes
C) Eosinophils
D) Basophils
Answer: B) Lymphocytes
Explanation: Lymphocytes, particularly T cells and B cells, play a crucial role in the immune response against viral infections.
MCQ 23:
Which of the following is a function of the kidneys related to blood?
A) Oxygen transport
B) Hormone production
C) Blood filtration
D) Nutrient absorption
Answer: C) Blood filtration
Explanation: The kidneys filter waste products and excess substances from the blood, playing a vital role in maintaining homeostasis.
MCQ 24:
What is the primary gas exchanged in the alveoli of the lungs?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen
Answer: A) Oxygen
Explanation: The primary function of alveoli is to facilitate the exchange of oxygen from the air into the blood and carbon dioxide from the blood into the air.
MCQ 25:
Which blood vessel has the thickest walls?
A) Capillaries
B) Veins
C) Arteries
D) Lymphatic vessels
Answer: C) Arteries
Explanation: Arteries have thicker walls than veins to withstand the higher pressure of blood being pumped from the heart.
MCQ 26:
What is the function of fibrinogen in blood?
A) Oxygen transport
B) Blood clotting
C) Nutrient transport
D) Immune response
Answer: B) Blood clotting
Explanation: Fibrinogen is a protein in blood plasma that is converted into fibrin during the clotting process, helping to form blood clots.
MCQ 27:
Which of the following components is NOT found in plasma?
A) Proteins
B) Electrolytes
C) Red blood cells
D) Nutrients
Answer: C) Red blood cells
Explanation: Red blood cells are suspended in plasma but are not a component of plasma itself, which consists mainly of water, proteins, electrolytes, and nutrients.
MCQ 28:
Which type of blood vessel carries deoxygenated blood from the tissues back to the heart?
A) Arteries
B) Capillaries
C) Veins
D) Lymphatic vessels
Answer: C) Veins
Explanation: Veins are responsible for returning deoxygenated blood to the heart from the body’s tissues.
MCQ 29:
What is the average heart rate of a resting adult?
A) 40-60 bpm
B) 60-100 bpm
C) 100-120 bpm
D) 120-140 bpm
Answer: B) 60-100 bpm
Explanation: The average resting heart rate for adults typically falls within the range of 60 to 100 beats per minute.
MCQ 30:
What is the main function of the aorta?
A) Pump blood
B) Carry deoxygenated blood
C) Distribute oxygenated blood to the body
D) Filter blood
Answer: C) Distribute oxygenated blood to the body
Explanation: The aorta is the largest artery in the body and carries oxygenated blood away from the heart to supply the rest of the body.
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