MSU BIO216 Lecture - Week 6 Objective Assignment

MSU BIO216 Lecture - Week 6 Objective Assignment - BIOL216...

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Unformatted text preview: BIOL216 Lecture Week 6 Objective Assignment Chapter 20: The Lymphatic System 1. List the functions of the lymphatic vessels. The lymphatic capillaries gradually join together to form a mesh-like network of tubes that are located deeper in the body. As they become larger, these structures are known as lymphatic vessels. Deeper within the body the lymphatic vessels become progressively larger and are located near major veins. Like veins, lymphatic vessels, which are known as lymphangions have one-way valves to prevent any backward flow. Each angions is a segment created by the space between two sets of valves. Smooth muscles in the walls of the lymphatic vessels cause the angions to contract sequentially to aid the flow of lymph toward the thoracic region. Because of their shape, these vessels are previously referred to as a string of pearls. Afferent lymphatic vessels carry unfiltered lymph into the node. Here waste products, and some of the fluid, are filtered out. Efferent lymphatic vessels carry the filtered lymph out of the node to continue its return to the circulatory system. 2. Describe the source of lymph and mechanism(s) of lymph transport. Lymph originates as plasma, which is the fluid portion of blood. The arterial blood that flows out of the heart slows as it moves through a capillary bed. This slowing allows some plasma to leave the arterioles and flow into the tissues where it becomes tissue fluid. plasma to leave the arterioles and flow into the tissues where it becomes tissue fluid....
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MSU BIO216 Lecture - Week 6 Objective Assignment - BIOL216...

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