Q: Which of the following equations best represents the volume of interstitial fluid returned to the blood daily by the lymphatic system?

$$V_{lymph} = 3 \, \text{litres/day}$$

Question 1

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

Accepted Answer

To transport oxygen to tissues

Question 2

A blockage in the thoracic duct would most directly impair the drainage of lymph from which region?

Accepted Answer

The left lower limb

Question 3

Which structure is responsible for filtering lymph and removing bacteria and debris before lymph is returned to the bloodstream?

Accepted Answer

Lymph node

Question 4

Which of the following best describes the flow of lymph from the lower limbs back to the bloodstream?

Accepted Answer

Lymph capillaries → lymphatics → lymph node → lymphatic → cisterna chyli → thoracic duct → left subclavian vein

Question 5

Which of the following statements about lymphatic capillaries is TRUE?

Accepted Answer

They have overlapping endothelial cells that act as one-way valves

Question 6

A patient has a tumor blocking the right lymphatic duct. Which area is most likely to experience lymphatic fluid accumulation (lymphedema)?

Accepted Answer

Right arm

Question 7

Which of the following best explains why lymphatic vessels have more valves than veins?

Accepted Answer

To prevent backflow of lymph due to low pressure in the lymphatic system

Question 8

Which lymphoid organ is responsible for the maturation of T-lymphocytes and is most active during childhood?

Accepted Answer

Thymus

Question 9

Which of the following is a correct statement about the spleen?

Accepted Answer

It removes worn-out red blood cells and stores platelets

Question 10

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

Accepted Answer

They transport absorbed lipids from the intestine to the blood via the lymphatic system

Question 11

A patient has a severe bacterial infection. Which cells in the lymph nodes are primarily responsible for phagocytosing bacteria?

Accepted Answer

Macrophages

Question 12

Which of the following is a function of lymph nodules such as Peyer's patches?

Accepted Answer

Defending against pathogens that penetrate mucosal surfaces

Question 13

Which of the following best describes the difference between non-specific and specific body defenses?

Accepted Answer

Non-specific defenses act as general barriers, while specific defenses target particular pathogens

Question 14

Which of the following is NOT a component of the first line of non-specific body defense?

Accepted Answer

T-lymphocytes

Question 15

A patient has a genetic defect preventing the formation of valves in their lymphatic vessels. Which of the following is the most likely consequence?

Accepted Answer

Backflow of lymph and tissue swelling (edema)

Question 16

Which of the following equations best represents the volume of interstitial fluid returned to the blood daily by the lymphatic system?

Accepted Answer

$$V_{lymph} = 3 \, 	ext{litres/day}$$

Question 17

Which of the following best explains why lymphatic capillaries can absorb larger particles (such as proteins and cell debris) compared to blood capillaries?

Accepted Answer

Their overlapping endothelial cells form flap-like minivalves that open wider under pressure

Question 18

Which of the following is a correct sequence of lymph flow through a lymph node?

Accepted Answer

Afferent lymphatic vessel → lymph node sinuses → efferent lymphatic vessel

Question 19

Which of the following best describes the function of the thymus gland?

Accepted Answer

It is the site where T-lymphocytes mature and become immunocompetent

Question 20

Which of the following is a likely consequence of surgical removal of the spleen (splenectomy)?

Accepted Answer

Decreased ability to remove old red blood cells and increased risk of infection

The Lymphatic System and Immunity: ANP College Study Notes

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