,BIOD 152 Module 5 Exam | Essential Human
Anatomy & Physiology II | Portage Learning | Q &
A | 2026 Edition
1. Which of the following best describes the primary function of the lymphatic system?
A) To transport oxygenated blood throughout the body
B) To return interstitial fluid to the bloodstream and play a key role in immunity
C) To filter metabolic waste products from the blood
D) To produce red blood cells in response to anemia
Correct Answer: To return interstitial fluid to the bloodstream and play a key role in immunity
Rationale: The lymphatic system is closely associated with the cardiovascular system. Its primary
functions are to return excess tissue fluid (lymph) to the bloodstream and to defend the body against
disease through immunity. It also absorbs fats from the digestive system.
2. What is the name of the organ, highlighted in blue in a typical diagram, that is a large lymphatic organ
located in the upper left quadrant of the abdomen?
A) Thymus
B) Liver
C) Spleen
D) Pancreas
Correct Answer: Spleen
Rationale: The spleen is a large lymphatic organ found in the upper left quadrant of the abdomen. Its
primary functions include filtering blood, recycling old red blood cells, and supporting immune function.
3. The thymus gland is located in which of the following areas?
A) In the upper left quadrant of the abdomen
,B) On the anterior surface of the heart, under the sternum
C) In the pelvic cavity, near the bladder
D) At the back of the throat
Correct Answer: On the anterior surface of the heart, under the sternum
Rationale: The thymus gland is a primary lymphoid organ located on the anterior surface of the heart,
beneath the sternum. It plays a crucial role in the development of T-lymphocytes.
4. True or False: Lymph flows from the tissues to the heart in a one-way direction.
A) True
B) False
Correct Answer: True
Rationale: Lymph flows in one direction only: from the tissues, through lymphatic capillaries and vessels,
and eventually into the venous system, returning to the heart. It does not flow from the heart out to the
tissues.
5. Which of the following statements is FALSE concerning lymph nodes?
A) They are encapsulated in fibrous connective tissue
B) They have many incoming (afferent) and fewer outgoing (efferent) lymphatic vessels
C) They act as a filtering center, removing infectious organisms and debris
D) They have more efferent vessels than afferent vessels
Correct Answer: They have more efferent vessels than afferent vessels
Rationale: Lymph nodes have many incoming (afferent) vessels and fewer outgoing (efferent) vessels.
This structural difference allows for efficient filtration of lymph as it passes through the node.
, 6. Fluid inside tissues that is not returned via the veins is returned to the heart via which system?
A) The cardiovascular system
B) The respiratory system
C) The lymphatic system
D) The endocrine system
Correct Answer: The lymphatic system
Rationale: Interstitial fluid that is not reabsorbed by venous capillaries enters lymphatic capillaries and is
eventually returned to the bloodstream through the lymphatic system.
7. Which lymphatic duct drains lymph from the right arm, the right side of the head and neck, and the
right thoracic area?
A) Thoracic duct
B) Right lymphatic duct
C) Cisterna chyli
D) Left lymphatic duct
Correct Answer: Right lymphatic duct
Rationale: The right lymphatic duct is smaller and drains lymph from the right arm, the right side of the
head and neck, and the right thoracic area. The larger thoracic duct drains the rest of the body.
8. What is the correct order of lymph flow through the lymphatic system?
A) Lymphatic capillaries → lymphatic vessels → lymphatic ducts → veins
B) Lymphatic vessels → lymphatic capillaries → lymphatic ducts → veins
C) Lymphatic ducts → lymphatic vessels → lymphatic capillaries → veins
D) Lymphatic capillaries → lymphatic ducts → lymphatic vessels → veins
Correct Answer: Lymphatic capillaries → lymphatic vessels → lymphatic ducts → veins
Anatomy & Physiology II | Portage Learning | Q &
A | 2026 Edition
1. Which of the following best describes the primary function of the lymphatic system?
A) To transport oxygenated blood throughout the body
B) To return interstitial fluid to the bloodstream and play a key role in immunity
C) To filter metabolic waste products from the blood
D) To produce red blood cells in response to anemia
Correct Answer: To return interstitial fluid to the bloodstream and play a key role in immunity
Rationale: The lymphatic system is closely associated with the cardiovascular system. Its primary
functions are to return excess tissue fluid (lymph) to the bloodstream and to defend the body against
disease through immunity. It also absorbs fats from the digestive system.
2. What is the name of the organ, highlighted in blue in a typical diagram, that is a large lymphatic organ
located in the upper left quadrant of the abdomen?
A) Thymus
B) Liver
C) Spleen
D) Pancreas
Correct Answer: Spleen
Rationale: The spleen is a large lymphatic organ found in the upper left quadrant of the abdomen. Its
primary functions include filtering blood, recycling old red blood cells, and supporting immune function.
3. The thymus gland is located in which of the following areas?
A) In the upper left quadrant of the abdomen
,B) On the anterior surface of the heart, under the sternum
C) In the pelvic cavity, near the bladder
D) At the back of the throat
Correct Answer: On the anterior surface of the heart, under the sternum
Rationale: The thymus gland is a primary lymphoid organ located on the anterior surface of the heart,
beneath the sternum. It plays a crucial role in the development of T-lymphocytes.
4. True or False: Lymph flows from the tissues to the heart in a one-way direction.
A) True
B) False
Correct Answer: True
Rationale: Lymph flows in one direction only: from the tissues, through lymphatic capillaries and vessels,
and eventually into the venous system, returning to the heart. It does not flow from the heart out to the
tissues.
5. Which of the following statements is FALSE concerning lymph nodes?
A) They are encapsulated in fibrous connective tissue
B) They have many incoming (afferent) and fewer outgoing (efferent) lymphatic vessels
C) They act as a filtering center, removing infectious organisms and debris
D) They have more efferent vessels than afferent vessels
Correct Answer: They have more efferent vessels than afferent vessels
Rationale: Lymph nodes have many incoming (afferent) vessels and fewer outgoing (efferent) vessels.
This structural difference allows for efficient filtration of lymph as it passes through the node.
, 6. Fluid inside tissues that is not returned via the veins is returned to the heart via which system?
A) The cardiovascular system
B) The respiratory system
C) The lymphatic system
D) The endocrine system
Correct Answer: The lymphatic system
Rationale: Interstitial fluid that is not reabsorbed by venous capillaries enters lymphatic capillaries and is
eventually returned to the bloodstream through the lymphatic system.
7. Which lymphatic duct drains lymph from the right arm, the right side of the head and neck, and the
right thoracic area?
A) Thoracic duct
B) Right lymphatic duct
C) Cisterna chyli
D) Left lymphatic duct
Correct Answer: Right lymphatic duct
Rationale: The right lymphatic duct is smaller and drains lymph from the right arm, the right side of the
head and neck, and the right thoracic area. The larger thoracic duct drains the rest of the body.
8. What is the correct order of lymph flow through the lymphatic system?
A) Lymphatic capillaries → lymphatic vessels → lymphatic ducts → veins
B) Lymphatic vessels → lymphatic capillaries → lymphatic ducts → veins
C) Lymphatic ducts → lymphatic vessels → lymphatic capillaries → veins
D) Lymphatic capillaries → lymphatic ducts → lymphatic vessels → veins
Correct Answer: Lymphatic capillaries → lymphatic vessels → lymphatic ducts → veins
