Lymphatic System Functions and Structures

The video explains the lymphatic system, highlighting its roles in fluid return, nutrient transport, and immune surveillance. It details how lymph is formed, moves through vessels, and is processed by lymphoid organs like lymph nodes, spleen, and thymus. The system's structure, including capillaries and ducts, and its function in immune response are also covered.

What is one of the primary roles of the lymphatic system?

• To produce red blood cells

• To return fluid from tissues back to the heart

• To digest food

• To transport oxygen to the brain

How much fluid is left behind in the tissues each day that needs to be returned to the blood?

• 3 liters

• 20 liters

• 10 liters

• 5 liters

What makes lymphatic capillaries extremely permeable?

• Their thick walls

• The presence of a pump

• Endothelial cells that loosely overlap

• The presence of smooth muscle

Which duct collects lymph from the right arm and the right side of the head and chest?

• Intestinal trunk

• Right lymphatic duct

• Subclavian trunk

• Thoracic duct

What is the function of lacteals in the lymphatic system?

• To absorb fatty acids

• To transport oxygen

• To filter blood

• To produce hormones

Which lymphoid organ is responsible for filtering out old and defective blood cells?

• Lymph nodes

• Spleen

• Tonsils

• Thymus

What is the main role of the thymus in the lymphatic system?

• To store platelets

• To produce red blood cells

• To develop T cells

• To filter lymph

Where are Peyer's patches located?

• In the intestinal wall

• In the neck

• In the armpit

• In the spleen

What is the function of the tonsils in the lymphatic system?

• To store red blood cells

• To trap pathogens from food and air

• To produce lymph

• To produce antibodies

What is the role of dendritic cells in the lymph nodes?

• To produce lymph

• To destroy red blood cells

• To present antigens to B cells

• To transport oxygen