Part 3: Lymph – Composition, Functions, Lymphatic System (25 MCQs)

Q1. Lymph is formed from:

A. Plasma that leaks out of capillaries
B. WBCs only
C. Platelets only
D. Secretions of lymph nodes

Answer: A

Explanation:

A. Correct: Lymph originates from plasma filtered into interstitial fluid.
B. Incorrect: WBCs are present in lymph, but they do not form it.
C. Incorrect: Platelets are absent.
D. Incorrect: Lymph nodes filter lymph but do not produce it.

Q2. Lymph is similar to plasma but lacks:

A. Water
B. Glucose
C. Plasma proteins in high concentration
D. Salts

Answer: C

Explanation:

A. Incorrect: Water is present.
B. Incorrect: Glucose is present.
C. Correct: Lymph has fewer plasma proteins than blood plasma.
D. Incorrect: Salts are present.

Q3. The main function of lymph is:

A. Oxygen transport
B. Fat absorption and immune defense
C. Clot formation
D. Temperature regulation

Answer: B

Explanation:

A. Incorrect: Oxygen is transported by RBCs.
B. Correct: Lymph absorbs fats (via lacteals) and provides immunity.
C. Incorrect: Lymph doesn’t clot.
D. Incorrect: Temperature regulation by blood.

Q4. Lymph differs from blood in that it lacks:

A. WBCs
B. RBCs and platelets
C. Plasma
D. Antibodies

Answer: B

Explanation:

A. Incorrect: WBCs are present.
B. Correct: RBCs and platelets are absent in lymph.
C. Incorrect: Plasma-like fluid is present.
D. Incorrect: Antibodies are present in lymph.

Q5. Lacteals are specialized lymphatic vessels present in:

A. Liver
B. Small intestine villi
C. Lungs
D. Kidneys

Answer: B

Explanation:

A. Incorrect: Liver has hepatic vessels, not lacteals.
B. Correct: Lacteals in villi absorb dietary fats.
C. Incorrect: Lungs lack lacteals.
D. Incorrect: Kidneys filter urine, not lymph.

Q6. The thoracic duct drains lymph from:

A. Right arm and right head
B. Left side of body and both legs
C. Only digestive system
D. Only head region

Answer: B

Explanation:

A. Incorrect: Right arm/head drain into right lymphatic duct.
B. Correct: Thoracic duct drains left body + both legs into left subclavian vein.
C. Incorrect: Not just digestive.
D. Incorrect: Head has multiple lymphatics.

Q7. The right lymphatic duct drains lymph from:

A. Entire body
B. Right arm, right thorax, right head
C. Both legs only
D. Left thorax

Answer: B

Explanation:

A. Incorrect: Entire body drained mainly by thoracic duct.
B. Correct: Right lymphatic duct drains right upper quadrant.
C. Incorrect: Legs drain into thoracic duct.
D. Incorrect: Left thorax drains to thoracic duct.

Q8. Which immune cells are abundant in lymph?

A. RBCs
B. Lymphocytes
C. Platelets
D. Eosinophils

Answer: B

Explanation:

A. Incorrect: RBCs absent.
B. Correct: Lymphocytes are key immune cells in lymph.
C. Incorrect: Platelets absent.
D. Incorrect: Eosinophils rare.

Q9. Lymph nodes act as:

A. Blood storage
B. Filters for pathogens
C. Oxygen reservoirs
D. Sites of platelet production

Answer: B

Explanation:

A. Incorrect: Spleen stores blood, not lymph nodes.
B. Correct: Lymph nodes filter lymph, trap pathogens.
C. Incorrect: Not oxygen reservoirs.
D. Incorrect: Platelets from bone marrow, not nodes.

Q10. Chyle is lymph rich in:

A. Oxygen
B. Fats
C. Glucose
D. WBCs

Answer: B

Explanation:

A. Incorrect: O₂ carried by blood.
B. Correct: Chyle = lymph from intestine with absorbed fats.
C. Incorrect: Glucose is present but not main component.
D. Incorrect: WBCs are present but not defining feature.

Q11. Lymph capillaries are absent in:

A. Intestine
B. CNS
C. Liver
D. Lungs

Answer: B

Explanation:

A. Incorrect: Present in intestine as lacteals.
B. Correct: CNS lacks lymph capillaries.
C. Incorrect: Liver has lymphatics.
D. Incorrect: Lungs have lymphatics.

Q12. The spleen is functionally a part of:

A. Respiratory system
B. Digestive system
C. Lymphatic system
D. Nervous system

Answer: C

Explanation:

A. Incorrect: Not respiratory.
B. Incorrect: Not digestive.
C. Correct: Spleen is a lymphoid organ → filters blood, immune role.
D. Incorrect: Not nervous.

Q13. Which organ is called “graveyard of RBCs”?

A. Liver
B. Bone marrow
C. Spleen
D. Kidney

Answer: C

Explanation:

A. Incorrect: Liver helps recycle but not primary removal.
B. Incorrect: Bone marrow produces RBCs.
C. Correct: Spleen destroys old RBCs.
D. Incorrect: Kidney filters waste, not RBCs.

Q14. Which cells are matured in the thymus gland?

A. B-lymphocytes
B. T-lymphocytes
C. Monocytes
D. Neutrophils

Answer: B

Explanation:

A. Incorrect: B cells mature in bone marrow.
B. Correct: T-lymphocytes mature in thymus.
C. Incorrect: Monocytes mature into macrophages.
D. Incorrect: Neutrophils mature in bone marrow.

Q15. Lymph returns to the venous circulation via:

A. Hepatic vein
B. Subclavian veins
C. Jugular veins
D. Renal veins

Answer: B

Explanation:

A. Incorrect: Hepatic vein drains liver.
B. Correct: Lymph enters blood via subclavian veins.
C. Incorrect: Jugular drains head, not lymph.
D. Incorrect: Renal veins drain kidneys.

Q16. The lymphatic system helps in maintaining:

A. Oxygen transport
B. Osmotic balance between blood and tissue fluid
C. Nerve impulse conduction
D. Enzyme secretion

Answer: B

Explanation:

A. Incorrect: RBCs transport O₂.
B. Correct: Lymph removes excess tissue fluid, maintaining balance.
C. Incorrect: Nerve impulses not related.
D. Incorrect: Enzymes not secreted by lymph.

Q17. Which of the following is NOT a lymphoid organ?

A. Tonsils
B. Thymus
C. Liver
D. Spleen

Answer: C

Explanation:

A. Incorrect: Tonsils = lymphoid organ.
B. Incorrect: Thymus = lymphoid organ.
C. Correct: Liver = digestive organ.
D. Incorrect: Spleen = lymphoid organ.

Q18. Lymph transports absorbed fats in the form of:

A. Chylomicrons
B. Free fatty acids
C. Glycerol
D. Amino acids

Answer: A

Explanation:

A. Correct: Fats absorbed as chylomicrons into lacteals.
B. Incorrect: Free fatty acids re-esterified before absorption.
C. Incorrect: Glycerol absorbed directly into blood.
D. Incorrect: Amino acids absorbed in blood, not lymph.

Q19. Which lymphoid organ stores blood and filters pathogens?

A. Thymus
B. Spleen
C. Tonsils
D. Bone marrow

Answer: B

Explanation:

A. Incorrect: Thymus matures T-cells.
B. Correct: Spleen stores blood, filters pathogens.
C. Incorrect: Tonsils protect throat region.
D. Incorrect: Bone marrow produces blood cells.

Q20. Which lymphoid tissue guards the entry of the respiratory and digestive system?

A. Spleen
B. Bone marrow
C. Tonsils
D. Thymus

Answer: C

Explanation:

A. Incorrect: Spleen filters blood.
B. Incorrect: Bone marrow not barrier.
C. Correct: Tonsils protect pharyngeal region.
D. Incorrect: Thymus develops T-cells.

Q21. Lymphocytes that produce antibodies are:

A. B-cells
B. T-cells
C. NK cells
D. Monocytes

Answer: A

Explanation:

A. Correct: B-cells → plasma cells → antibodies.
B. Incorrect: T-cells mediate cell immunity.
C. Incorrect: NK cells kill infected cells directly.
D. Incorrect: Monocytes are phagocytes.

Q22. Which lymphatic structure drains lymph from digestive organs?

A. Thoracic duct
B. Right lymphatic duct
C. Hepatic vein
D. Coronary sinus

Answer: A

Explanation:

A. Correct: Thoracic duct collects lymph, including from intestines (chyle).
B. Incorrect: Right duct drains right upper body.
C. Incorrect: Hepatic vein drains liver blood.
D. Incorrect: Coronary sinus drains heart blood.

Q23. Primary lymphoid organs include:

A. Spleen and tonsils
B. Bone marrow and thymus
C. Liver and kidney
D. Lymph nodes and spleen

Answer: B

Explanation:

A. Incorrect: These are secondary organs.
B. Correct: Bone marrow and thymus = primary (lymphocyte maturation).
C. Incorrect: Not lymphoid organs.
D. Incorrect: Secondary lymphoid organs.

Q24. Secondary lymphoid organs include:

A. Bone marrow and thymus
B. Lymph nodes and spleen
C. Liver and thymus
D. Kidney and tonsils

Answer: B

Explanation:

A. Incorrect: Primary lymphoid organs.
B. Correct: Secondary = lymph nodes, spleen, tonsils.
C. Incorrect: Liver not lymphoid.
D. Incorrect: Kidney not lymphoid.

Q25. Lymph plays an important role in:

A. Gas exchange
B. Transport of hormones only
C. Defense and fat transport
D. Blood clotting

Answer: C

Explanation:

A. Incorrect: Gas exchange via lungs/blood.
B. Incorrect: Hormones transported in blood, not lymph alone.
C. Correct: Lymph → defense (WBCs) + fat absorption.
D. Incorrect: Lymph doesn’t clot.

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Part 3: Lymph – Composition, Functions, Lymphatic System (25 MCQs)