CLT Lymphatic System Anatomy & Physiology 1 — Questions and Answers
Question 1: What is the primary function of the lymphatic system in the body?
- Transporting oxygen to cells
- Returning interstitial fluid to the bloodstream and supporting immune defense (Correct answer)
- Producing red blood cells
- Regulating blood pressure
Correct answer: Returning interstitial fluid to the bloodstream and supporting immune defense
The lymphatic system collects excess interstitial fluid and returns it to the venous circulation while also transporting immune cells.
Question 2: Which structures are responsible for filtering lymph fluid as it travels through the lymphatic system?
- Lymphatic capillaries
- Lymph nodes (Correct answer)
- Thoracic duct
- Lacteals
Correct answer: Lymph nodes
Lymph nodes act as filtration stations where lymph is cleansed of pathogens and debris before re-entering circulation.
Question 3: The thoracic duct drains lymph from which portion of the body?
- Right side of the head and neck only
- Right upper quadrant
- The entire body except the right upper quadrant (Correct answer)
- Lower extremities only
Correct answer: The entire body except the right upper quadrant
The thoracic duct is the largest lymphatic vessel and drains approximately three-quarters of the body, emptying into the left subclavian vein.
Question 4: What distinguishes lymphatic capillaries from blood capillaries?
- Lymphatic capillaries have a complete basement membrane
- Lymphatic capillaries have overlapping endothelial cells acting as one-way valves (Correct answer)
- Lymphatic capillaries carry red blood cells
- Lymphatic capillaries are smaller in diameter
Correct answer: Lymphatic capillaries have overlapping endothelial cells acting as one-way valves
The overlapping endothelial 'flap' cells of lymphatic capillaries allow large molecules and excess fluid to enter but prevent backflow.
Question 5: Where does the right lymphatic duct empty into the circulation?
- Left subclavian vein
- Superior vena cava
- Right subclavian vein (Correct answer)
- Internal jugular vein
Correct answer: Right subclavian vein
The right lymphatic duct empties lymph from the right upper quadrant into the right subclavian vein at the venous angle.
Question 6: Lacteals are specialized lymphatic capillaries found in which organ?
- Liver
- Kidneys
- Small intestine villi (Correct answer)
- Lungs
Correct answer: Small intestine villi
Lacteals in the small intestine absorb dietary fats and fat-soluble vitamins, forming chyle that enters the thoracic duct.
CLT Lymphatic System Anatomy & Physiology 1
What is the primary function of the lymphatic system in the body?