Anatomy Exam Anatomy Lymphatic System 1 — Questions and Answers
Question 1: Where does the thoracic duct empty into the venous system?
- Right subclavian vein
- Left subclavian–internal jugular junction (Correct answer)
- Superior vena cava
- Azygos vein
Correct answer: Left subclavian–internal jugular junction
The thoracic duct empties at the junction of the left subclavian and left internal jugular veins (left venous angle).
Question 2: Which is the largest lymphoid organ in the body?
- Thymus
- Lymph node
- Spleen (Correct answer)
- Palatine tonsil
Correct answer: Spleen
The spleen is the largest lymphoid organ, filtering blood and housing lymphocytes in white pulp.
Question 3: What is the primary function of lymphatic capillaries?
- Transport oxygen to tissues
- Collect interstitial fluid and return it to the bloodstream (Correct answer)
- Filter blood
- Produce red blood cells
Correct answer: Collect interstitial fluid and return it to the bloodstream
Lymphatic capillaries collect excess interstitial fluid, proteins, and lipids and channel them back to the venous circulation.
Question 4: Which zone of a lymph node contains primarily B lymphocytes?
- Medulla
- Cortex (germinal centers) (Correct answer)
- Subcapsular sinus
- Hilum
Correct answer: Cortex (germinal centers)
The outer cortex, especially the germinal centers of lymphoid follicles, contains primarily B lymphocytes.
Question 5: The right lymphatic duct drains lymph from which regions?
- Left upper body only
- Entire lower body
- Right side of head/neck, right arm, and right thorax (Correct answer)
- Left leg and left arm
Correct answer: Right side of head/neck, right arm, and right thorax
The right lymphatic duct drains the right side of the head and neck, right upper extremity, and right thoracic cavity.
Question 6: Peyer's patches are lymphoid aggregates located in which organ?
- Stomach
- Ileum of the small intestine (Correct answer)
- Appendix
- Large intestine
Correct answer: Ileum of the small intestine
Peyer's patches are large aggregates of lymphoid follicles in the lamina propria and submucosa of the ileum.
Anatomy Exam Anatomy Lymphatic System 1
Where does the thoracic duct empty into the venous system?