BIOL 141 Lecture Notes - Lecture 15: Extracellular Fluid, Blood Vessel, Thymus

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14 Aug 2016
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Lymphatic system: critical for circulatory system function & immunity a. i. Site of immune cells (disease fighting cells: two parts b. i. Network of vessels that extends to all tissues of the body b. ii. Organs and tissues that produce and maintain immune cells: structures include: c. i. Fluid recovery: humans 4-6 liters of blood, capillaries are leaky b. i. 2-4 liters of water diffuse into tissues daily b. ii. Called interstitial fluid: lymph vessels absorbs interstitial fluid, transport back to blood vessel to help maintain blood volume. Lymph nodes and immunity: lymph nodes are bean-shaped structures of lymph tissue a. i. Contain cells that help with immunity (lymphocytes: lymph nodes filter lymph as it travels back to the blood stream b. i. Helps to detect foreign invaders in the body: when sick, lymph nodes become swollen and painful c. i. This occurs because of an increase in lymphocytes during illness.

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