Q: Which of the following equations best represents the relationship between interstitial fluid, lymph, and blood plasma?

$$\text{Blood plasma} \rightarrow \text{Interstitial fluid} \rightarrow \text{Lymph} \rightarrow \text{Blood plasma}$$

Question 1

Which of the following best describes the primary function of the lymphatic system?

Accepted Answer

It returns interstitial fluid to the bloodstream and plays a role in immune defense.

Question 2

What is the correct sequence of lymph flow from the tissues back to the bloodstream?

Accepted Answer

Lymphatic capillaries → lymphatic collecting vessels → lymph nodes → lymph trunks → lymph ducts → veins

Question 3

Which structure is responsible for absorbing dietary fats in the small intestine?

Accepted Answer

Lacteal

Question 4

A patient presents with severe swelling in one leg after lymph node removal. What is the most likely diagnosis?

Accepted Answer

Lymphedema

Question 5

Which of the following statements about lymphatic capillaries is TRUE?

Accepted Answer

They are closed-end tubes made of overlapping endothelial cells that form minivalves.

Question 6

What is the main reason lymph nodes swell during an infection?

Accepted Answer

A large number of lymphocytes and trapped pathogens accumulate in the node

Question 7

Which of the following best explains why the lymphatic system is considered a 'one-way' system?

Accepted Answer

Lymph flows from tissues toward the heart and does not return to the tissues.

Question 8

Which lymphatic duct drains lymph from the right arm, right side of the head, and right thoracic cavity?

Accepted Answer

Right lymphatic duct

Question 9

A parasite blocks the lymphatic vessels in a patient, causing massive swelling of the lower limb. What is this condition called?

Accepted Answer

Elephantiasis

Question 10

Which of the following is NOT a function of the lymphatic system?

Accepted Answer

Producing hormones for metabolism

Question 11

Which of the following best describes the structure of a lymph node?

Accepted Answer

It has an outer cortex and inner medulla, with afferent vessels entering and efferent vessels exiting.

Question 12

Which of the following equations best represents the relationship between interstitial fluid, lymph, and blood plasma?

Accepted Answer

$$	ext{Blood plasma} ightarrow 	ext{Interstitial fluid} ightarrow 	ext{Lymph} ightarrow 	ext{Blood plasma}$$

Question 13

A blockage in which of the following would most likely cause widespread edema in the lower limbs and abdomen?

Accepted Answer

Thoracic duct

Question 14

Which of the following is TRUE regarding the valves in lymphatic collecting vessels?

Accepted Answer

They prevent the backflow of lymph, ensuring one-way movement toward the heart.

Question 15

Which of the following best explains why fats absorbed in the small intestine enter the lymphatic system rather than directly entering the blood capillaries?

Accepted Answer

Fats are too large to enter blood capillaries and are instead absorbed by lacteals.

Question 16

A patient with a parasitic infection develops severe swelling in the lower limbs. Which organism is most likely responsible for this condition?

Accepted Answer

Wuchereria bancrofti

Question 17

Which of the following best describes the role of the spleen in the lymphatic system?

Accepted Answer

It filters blood, removes old red blood cells, and helps mount immune responses.

Question 18

Which of the following is a direct consequence of lymphatic vessel obstruction?

Accepted Answer

Accumulation of interstitial fluid in tissues, leading to swelling

Question 19

Which of the following is the correct formula for calculating the net movement of fluid across a capillary wall, considering hydrostatic and osmotic pressures?

Accepted Answer

$$	ext{Net filtration} = (P_c - P_i) - (\pi_c - \pi_i)$$

Question 20

Which of the following best explains why lymphatic vessels have thinner walls than veins?

Accepted Answer

Lymph is under lower pressure than blood, so thick walls are not necessary.

The Lymphatic and Immune Systems: Structure and Function

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