1. Lymphatic capillaries a. Lymphatic capillaries are microscopic, closed-ended tubes that extend into interstitial spaces.
b. They receive lymph through their thin walls.
c. Lacteals are lymphatic capillaries in the villi of the small intestine.
2. Lymphatic vessels a. Lymphatic vessels are formed by the merging of lymphatic capillaries.
b. They have walls similar to veins, only thinner, and possess valves that prevent backflow of lymph.
c. Larger lymphatic vessels lead to lymph nodes and then merge into lymphatic trunks.
3. Lymphatic trunks and collecting ducts a. Lymphatic trunks drain lymph from large body regions.
b. Trunks lead to two collecting ducts within the thorax.
c. Collecting ducts join the subclavian veins.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.