50 Most Important NEET PYQs of Chapter 18: Body Fluids and Circulation – Part 1 (Q1–25)

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 🔥 50 Most Important NEET PYQs of Chapter 18: Body Fluids and Circulation – Part 1 (Q1–25)

📘 By neetpyqall | biologyatease1.blogspot.com

Welcome to Part 1 of Chapter 18: Body Fluids and Circulation, where we cover Q1 to Q25 of past NEET questions with clear, exam-focused explanations!

1. What is the normal pH of human blood?

A) 6.8
B) 7.4
C) 7.0
D) 8.4
✅ Answer: B) 7.4
🧠 Explanation: Blood is slightly alkaline, maintained by buffer systems.

2. Which of the following is responsible for clotting of blood?

A) Red blood cells
B) White blood cells
C) Platelets
D) Plasma
✅ Answer: C) Platelets
🧠 Explanation: Platelets release thromboplastin, initiating clotting cascade.

3. Universal donor blood group is:

A) A
B) B
C) AB
D) O
✅ Answer: D) O
🧠 Explanation: O group lacks A and B antigens, so can be given to anyone.

4. Which of these is a granulocyte?

A) Lymphocyte
B) Monocyte
C) Neutrophil
D) Erythrocyte
✅ Answer: C) Neutrophil
🧠 Explanation: Granulocytes have cytoplasmic granules; neutrophils are most abundant.

5. What is the main function of RBCs?

A) Immune defense
B) Clotting
C) Oxygen transport
D) Hormone production
✅ Answer: C) Oxygen transport
🧠 Explanation: Hemoglobin in RBCs binds and transports oxygen.

6. Which chamber of the heart receives oxygenated blood from lungs?

A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
✅ Answer: B) Left atrium
🧠 Explanation: Pulmonary veins bring oxygenated blood to the left atrium.

7. SA node is located in:

A) Left atrium
B) Right atrium
C) Left ventricle
D) Right ventricle
✅ Answer: B) Right atrium
🧠 Explanation: The sinoatrial node initiates the heartbeat—known as the pacemaker.

8. The largest artery in the human body is:

A) Carotid artery
B) Pulmonary artery
C) Aorta
D) Renal artery
✅ Answer: C) Aorta
🧠 Explanation: Aorta distributes oxygenated blood to all systemic organs.

9. Which blood vessels carry blood from heart to lungs?

A) Pulmonary veins
B) Pulmonary arteries
C) Aorta
D) Vena cava
✅ Answer: B) Pulmonary arteries
🧠 Explanation: Only artery that carries deoxygenated blood to lungs.

10. Tricuspid valve is located between:

A) Left atrium and left ventricle
B) Right atrium and right ventricle
C) Left atrium and pulmonary vein
D) Right ventricle and pulmonary artery
✅ Answer: B) Right atrium and right ventricle
🧠 Explanation: It prevents backflow of blood during ventricular contraction.

11. Cardiac output is:

A) Volume of blood pumped by each atrium per minute
B) Volume of blood pumped by each ventricle per beat
C) Volume of blood pumped by each ventricle per minute
D) Volume of blood received by right atrium
✅ Answer: C) Volume of blood pumped by each ventricle per minute
🧠 Explanation: It is approximately 5 liters/min in resting adult.

12. Which blood vessel has valves to prevent backflow?

A) Arteries
B) Capillaries
C) Veins
D) Arterioles
✅ Answer: C) Veins
🧠 Explanation: Veins carry blood against gravity, so valves help maintain one-way flow.

13. Which of the following initiates the heartbeat?

A) AV node
B) SA node
C) Purkinje fibers
D) Bundle of His
✅ Answer: B) SA node
🧠 Explanation: Known as the natural pacemaker of the heart.

14. Which layer of the heart contains cardiac muscles?

A) Endocardium
B) Epicardium
C) Myocardium
D) Pericardium
✅ Answer: C) Myocardium
🧠 Explanation: It is the thick, muscular middle layer responsible for contractions.

15. The oxygenated blood from lungs is carried to the heart by:

A) Pulmonary artery
B) Pulmonary vein
C) Coronary vein
D) Superior vena cava
✅ Answer: B) Pulmonary vein
🧠 Explanation: Only vein that carries oxygenated blood.

16. Double circulation means:

A) Blood passes twice through the heart in one cycle
B) Blood circulates only in lungs
C) Blood goes to heart only once
D) Blood passes through two hearts
✅ Answer: A) Blood passes twice through the heart in one cycle
🧠 Explanation: Once for oxygenation (pulmonary), once for body (systemic).

17. The lymphatic system helps in:

A) Blood circulation
B) Transport of oxygen
C) Absorption of fats
D) Gas exchange
✅ Answer: C) Absorption of fats
🧠 Explanation: Lacteals in intestines absorb dietary fats.

18. Which part of ECG represents ventricular depolarization?

A) P wave
B) T wave
C) QRS complex
D) PR interval
✅ Answer: C) QRS complex
🧠 Explanation: It corresponds to ventricular contraction.

19. Blood pressure is measured using:

A) Electrocardiogram
B) Stethoscope
C) Sphygmomanometer
D) Spirometer
✅ Answer: C) Sphygmomanometer
🧠 Explanation: Measures systolic and diastolic pressure.

20. Which blood component helps in immunity?

A) RBC
B) Platelets
C) WBC
D) Plasma proteins
✅ Answer: C) WBC
🧠 Explanation: White blood cells fight infections and foreign particles.

21. Which vein brings deoxygenated blood from lower body to heart?

A) Pulmonary vein
B) Hepatic vein
C) Inferior vena cava
D) Superior vena cava
✅ Answer: C) Inferior vena cava
🧠 Explanation: It brings blood to the right atrium.

22. Stroke volume is:

A) Volume of blood pumped per beat
B) Volume of blood pumped per minute
C) Heart rate
D) Blood volume in aorta
✅ Answer: A) Volume of blood pumped per beat
🧠 Explanation: In a healthy adult, it's about 70 mL per beat.

23. Heart sounds are produced due to:

A) Contraction of muscles
B) Opening of valves
C) Closing of valves
D) Blood flowing in arteries
✅ Answer: C) Closing of valves
🧠 Explanation: "Lub" is AV valve closure; "dub" is semilunar valve closure.

24. Which organ regulates the production of RBCs?

A) Liver
B) Kidney
C) Spleen
D) Pancreas
✅ Answer: B) Kidney
🧠 Explanation: Kidney releases erythropoietin which stimulates RBC production.

25. Which blood vessel carries oxygenated blood in fetal circulation?

A) Umbilical vein
B) Umbilical artery
C) Pulmonary artery
D) Inferior vena cava
✅ Answer: A) Umbilical vein
🧠 Explanation: It carries oxygen-rich blood from placenta to fetus.

🎯 Part 1 Complete! You're halfway through mastering Chapter 18 for NEET.

📌 Stay consistent and keep revising. When you're ready, type “next” to continue to Part 2 (Q26–50) of Body Fluids and Circulation.

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