Question 1

Which lymphatic duct is responsible for draining lymph from the majority of the body, and what is its anatomical significance?

Accepted Answer

Thoracic duct; it drains lymph from about three-fourths of the body, including the lower extremities and left side.

Question 2

A patient presents with severe swelling of the lower limb after a parasitic infection. Which condition is most likely, and what is the underlying cause?

Accepted Answer

Elephantiasis; caused by prolonged infestation with Filaria worms blocking lymphatic vessels.

Question 3

Which of the following best describes the function of lymph nodes in the context of cancer metastasis?

Accepted Answer

Lymph nodes filter lymph and may trap cancer cells, which can then spread to other areas via the lymphatic system.

Question 4

What is the primary mechanism by which complement proteins destroy foreign cells?

Accepted Answer

They form doughnut-shaped complexes that create holes in the plasma membrane, causing cell lysis.

Question 5

Which equation best represents the osmotic effect leading to cell lysis during the complement cascade?

Accepted Answer

$$ \pi = iMRT $$

Question 6

A newborn is diagnosed with a congenital absence of the thymus gland. Which immune cell type will be most affected, and what therapy might be required?

Accepted Answer

T cells; therapy to address immunity, possibly including bone marrow transplant.

Question 7

Which of the following is a real-life example of passive natural immunity?

Accepted Answer

Immunity passed from mother to fetus through the placenta.

Question 8

What is the primary function of plasma cells in the immune response?

Accepted Answer

They secrete antibodies into the blood.

Question 9

Which of the following best describes the process of phagocytosis?

Accepted Answer

Phagocytes ingest and destroy foreign cells or substances by engulfing them and breaking them down with lysosomal enzymes.

Question 10

A patient develops swelling and tenderness in lymph nodes after a bacterial infection. What is the most likely diagnosis?

Accepted Answer

Lymphadenitis

Question 11

Which of the following statements about the spleen is correct?

Accepted Answer

The spleen acts as a blood reservoir and salvages iron from hemoglobin.

Question 12

Which immune system cell is most numerous and circulates through body fluids searching for enemy cells?

Accepted Answer

Lymphocytes

Question 13

Which of the following is a characteristic of innate immunity?

Accepted Answer

It is rapid and recognizes a variety of nonself cells and particles.

Question 14

What is the primary function of the cisterna chyli in the lymphatic system?

Accepted Answer

It serves as a storage area for lymph moving toward the thoracic duct.

Question 15

Which of the following best describes the role of tonsils in the immune system?

Accepted Answer

They serve as the first line of defense against pathogens entering through the mouth and throat.

Question 16

Which equation best represents the relationship between blood flow and pressure in the context of lymphatic drainage?

Accepted Answer

$$ Q = \Delta P / R $$

Question 17

A patient with breast cancer undergoes removal of regional lymph nodes. What is a potential consequence of this procedure?

Accepted Answer

Greater risk for lymphedema.

Question 18

Which of the following is a function of helper T cells?

Accepted Answer

They release chemicals that attract and activate macrophages and help activate B cells.

Question 19

Which immune response is primarily responsible for delayed allergic reactions such as contact dermatitis?

Accepted Answer

Cell-mediated immunity

Question 20

A patient is diagnosed with systemic lupus erythematosus (SLE). Which mechanism is responsible for this autoimmune disease?

Accepted Answer

Excessive response to self-antigens resulting in production of numerous antibodies attacking various tissues.

Lymphatic System and Immunity: Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards