Q1. What is the primary function of the lymphatic system? (2022)
Solution:
The lymphatic system is responsible for transporting lymph, a fluid that contains infection-fighting white blood cells, and plays a crucial role in the immune system.
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Q2. Which of the following structures prevents backflow of blood in the heart? (2023)
Solution:
Valves in the heart prevent the backflow of blood, ensuring it flows in one direction through the heart chambers.
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Q3. What is the main function of plasma in the blood? (2023)
Solution:
Plasma is the liquid component of blood that carries nutrients, hormones, and waste products throughout the body.
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Q4. What is the primary function of hemoglobin? (2022)
Solution:
Hemoglobin's primary function is to transport oxygen from the lungs to the tissues.
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Q5. Which of the following is NOT a function of the circulatory system? (2023)
Solution:
The circulatory system does not produce hormones; it transports hormones produced by glands throughout the body.
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Q6. Which hormone regulates the production of red blood cells? (2019)
Solution:
Erythropoietin is a hormone produced by the kidneys that stimulates the production of red blood cells in the bone marrow.
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Q7. What is the normal pH range of human blood? (2019)
Solution:
The normal pH range of human blood is tightly regulated between 7.35 and 7.45, which is essential for proper physiological function.
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Q8. What is the average lifespan of a red blood cell in the human body? (2020)
Solution:
Red blood cells typically have an average lifespan of about 120 days before they are removed from circulation by the spleen.
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Q9. What is the primary component of plasma in blood? (2020)
Solution:
Plasma is composed of approximately 90% water, which serves as a solvent for various substances in the blood.
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Q10. Which type of white blood cell is primarily involved in the immune response? (2019)
Solution:
Lymphocytes are a type of white blood cell that plays a key role in the immune response.
