,BIOL252/BIOL 252 Human Anatomy & Physiology II w/Lab
Module 4 Exam | Portage Learning | 2026 Edition (PDF)
1. Which of the following is a primary function of the lymphatic system?
A) Transport of oxygen to tissues
B) Return of interstitial fluid to the bloodstream
C) Production of red blood cells
D) Regulation of blood glucose levels
Correct Answer: Return of interstitial fluid to the bloodstream
Rationale: The lymphatic system returns excess interstitial fluid (lymph) and filtered proteins to the
blood, maintaining fluid balance. It also plays roles in fat absorption and immune defense, but its
primary function is fluid homeostasis. Oxygen transport is a function of the cardiovascular system.
2. Which structure is the primary organ of the lymphatic system responsible for filtering blood and
removing old red blood cells?
A) Lymph node
B) Thymus
C) Spleen
D) Tonsil
Correct Answer: Spleen
Rationale: The spleen is a secondary lymphoid organ that filters blood, removing old and damaged red
blood cells, and acts as a reservoir for platelets and white blood cells. Lymph nodes filter lymph, not
blood.
3. Lymphatic capillaries are more permeable than blood capillaries due to the presence of:
A) A thick basement membrane
B) Tight junctions between endothelial cells
,C) One-way minivalves formed by overlapping endothelial cells
D) Fenestrations
Correct Answer: One-way minivalves formed by overlapping endothelial cells
Rationale: Lymphatic capillaries have overlapping endothelial cells that act as one-way minivalves,
allowing interstitial fluid and proteins to enter but preventing their escape. This unique structure makes
them more permeable than blood capillaries.
4. Which of the following is NOT a component of the lymphatic system?
A) Lymph nodes
B) Spleen
C) Thymus
D) Liver
Correct Answer: Liver
Rationale: The lymphatic system includes lymph, lymphatic vessels, lymphoid tissues, and organs such as
lymph nodes, spleen, thymus, and tonsils. The liver is a digestive organ, not a primary component of the
lymphatic system.
5. The right lymphatic duct drains lymph from which region of the body?
A) The entire body
B) The right upper quadrant (right side of head, neck, upper limb, and thorax)
C) The left upper quadrant
D) The lower limbs
Correct Answer: The right upper quadrant (right side of head, neck, upper limb, and thorax)
, Rationale: The right lymphatic duct drains lymph from the right side of the head and neck, the right
upper limb, and the right side of the thorax. The thoracic duct drains the rest of the body.
6. Which type of immunity is acquired through vaccination?
A) Naturally acquired active immunity
B) Artificially acquired active immunity
C) Naturally acquired passive immunity
D) Artificially acquired passive immunity
Correct Answer: Artificially acquired active immunity
Rationale: Vaccination introduces a harmless form of an antigen to stimulate the body's own immune
response, leading to the production of memory cells. This is artificially acquired active immunity.
7. An antigen is defined as:
A) A protein that destroys pathogens
B) A substance that triggers an immune response
C) A type of white blood cell
D) An antibody
Correct Answer: A substance that triggers an immune response
Rationale: An antigen is any molecule that is recognized by the immune system and triggers an immune
response, typically leading to the production of specific antibodies or activation of T cells.
8. Which of the following is a function of helper T cells (CD4+ T cells)?
A) Directly killing infected cells
B) Producing antibodies
C) Activating other immune cells (B cells, macrophages)
D) Suppressing the immune response
Module 4 Exam | Portage Learning | 2026 Edition (PDF)
1. Which of the following is a primary function of the lymphatic system?
A) Transport of oxygen to tissues
B) Return of interstitial fluid to the bloodstream
C) Production of red blood cells
D) Regulation of blood glucose levels
Correct Answer: Return of interstitial fluid to the bloodstream
Rationale: The lymphatic system returns excess interstitial fluid (lymph) and filtered proteins to the
blood, maintaining fluid balance. It also plays roles in fat absorption and immune defense, but its
primary function is fluid homeostasis. Oxygen transport is a function of the cardiovascular system.
2. Which structure is the primary organ of the lymphatic system responsible for filtering blood and
removing old red blood cells?
A) Lymph node
B) Thymus
C) Spleen
D) Tonsil
Correct Answer: Spleen
Rationale: The spleen is a secondary lymphoid organ that filters blood, removing old and damaged red
blood cells, and acts as a reservoir for platelets and white blood cells. Lymph nodes filter lymph, not
blood.
3. Lymphatic capillaries are more permeable than blood capillaries due to the presence of:
A) A thick basement membrane
B) Tight junctions between endothelial cells
,C) One-way minivalves formed by overlapping endothelial cells
D) Fenestrations
Correct Answer: One-way minivalves formed by overlapping endothelial cells
Rationale: Lymphatic capillaries have overlapping endothelial cells that act as one-way minivalves,
allowing interstitial fluid and proteins to enter but preventing their escape. This unique structure makes
them more permeable than blood capillaries.
4. Which of the following is NOT a component of the lymphatic system?
A) Lymph nodes
B) Spleen
C) Thymus
D) Liver
Correct Answer: Liver
Rationale: The lymphatic system includes lymph, lymphatic vessels, lymphoid tissues, and organs such as
lymph nodes, spleen, thymus, and tonsils. The liver is a digestive organ, not a primary component of the
lymphatic system.
5. The right lymphatic duct drains lymph from which region of the body?
A) The entire body
B) The right upper quadrant (right side of head, neck, upper limb, and thorax)
C) The left upper quadrant
D) The lower limbs
Correct Answer: The right upper quadrant (right side of head, neck, upper limb, and thorax)
, Rationale: The right lymphatic duct drains lymph from the right side of the head and neck, the right
upper limb, and the right side of the thorax. The thoracic duct drains the rest of the body.
6. Which type of immunity is acquired through vaccination?
A) Naturally acquired active immunity
B) Artificially acquired active immunity
C) Naturally acquired passive immunity
D) Artificially acquired passive immunity
Correct Answer: Artificially acquired active immunity
Rationale: Vaccination introduces a harmless form of an antigen to stimulate the body's own immune
response, leading to the production of memory cells. This is artificially acquired active immunity.
7. An antigen is defined as:
A) A protein that destroys pathogens
B) A substance that triggers an immune response
C) A type of white blood cell
D) An antibody
Correct Answer: A substance that triggers an immune response
Rationale: An antigen is any molecule that is recognized by the immune system and triggers an immune
response, typically leading to the production of specific antibodies or activation of T cells.
8. Which of the following is a function of helper T cells (CD4+ T cells)?
A) Directly killing infected cells
B) Producing antibodies
C) Activating other immune cells (B cells, macrophages)
D) Suppressing the immune response
