Lymphatic System Functions and Structures

The video explains the lymphatic system, highlighting its roles in fluid return, hormone transport, and immune surveillance. It details how fluid moves from blood to interstitial fluid and becomes lymph, which is then returned to the bloodstream. The structure and function of lymphatic vessels, including capillaries and valves, are discussed. The system's role in nutrient transport and immune function is emphasized, with a focus on lymphoid organs like lymph nodes, spleen, thymus, and tonsils. The video concludes with a recap of the lymphatic system's functions.

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

• To digest food

• To return fluid from tissues back to the heart

• To produce red blood cells

• 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

• 10 liters

• 5 liters

• 20 liters

What makes lymphatic capillaries extremely permeable?

• The presence of a pump

• The presence of smooth muscle

• Their thick walls

• Endothelial cells that loosely overlap

What helps lymph move through the lymphatic system?

• The pulsing of nearby arteries and skeletal muscle contractions

• The force of blood pressure

• A central pump

• Gravity

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

• Thoracic duct

• Left lymphatic duct

• Right lymphatic duct

• Intestinal trunk

What is the role of lacteals in the lymphatic system?

• To produce white blood cells

• To absorb fatty acids

• To filter blood

• To transport oxygen

What is the primary function of lymph nodes?

• To filter lymph and act as lookout points for immune defenses

• To produce hormones

• To produce digestive enzymes

• To store red blood cells

Where are Peyer's patches located?

• In the spleen

• In the intestinal wall

• In the armpit

• In the neck

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

• To filter blood

• To develop T cells and ensure they do not react to self-antigens

• To produce red blood cells

• To store iron

What is the main function of the tonsils?

• To produce antibodies

• To trap pathogens from food and air

• To produce hormones

• To store lymph