CLT Lymphatic System Anatomy & Physiology

Question 1

What is the primary function of the lymphatic system in the body?

Accepted Answer

Returning interstitial fluid to the bloodstream and supporting immune defense

Answer

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?

Accepted Answer

Lymph nodes

Answer

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?

Accepted Answer

The entire body except the right upper quadrant

Answer

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?

Accepted Answer

Lymphatic capillaries have overlapping endothelial cells acting as one-way valves

Answer

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?

Accepted Answer

Right subclavian vein

Answer

The right lymphatic duct empties lymph from the right upper quadrant into the right subclavian vein at the venous angle.

CLT - Certified Lymphatic Therapist Practice Test