Biology 3.4

Question 1

Lymphatic system

Answer 1

A second vascular network of blind-ended tubules that drain excess fluid, prevent swelling, transport materials and dispose of waste. Lymph is formed when interstitial fluid between body tissues is collected in the lymph capillaries.

Question 2

Lymph

Answer 2

Circulates due to contractions of smooth muscle and valves that prevent back flow, transported through lymph nodes.

Question 3

Lymph nodes

Answer 3

“Filters” that scan lymph for pathogens. Produces WBCs called lymphocytes that detect and kill pathogens before lymph is returned to blood circulatory system.