In this video, we're going to talk more about lymphatic capillaries, which we already know from previous lesson videos are the smallest of the lymphatic vessels and the most numerous as well. And as you can see in this image down below, the lymphatic capillaries, which are shown in green, are often closely associated with blood capillaries of the cardiovascular system. Because, again, recall from previous videos that blood capillaries often leak fluids and some proteins, and those leaked fluids and proteins can be absorbed by the lymphatic capillaries and propelled through the lymphatic vessels to be ultimately returned back to the cardiovascular system to maintain fluid balance. Now these lymphatic capillaries are significantly more permeable than most blood capillaries of the cardiovascular system, and this has to do with the unique structure of the lymphatic capillaries. In fact, these lymphatic capillaries are so permeable that it was once incorrectly thought in the past that they were open-ended like a straw. But again, today, we know that this is not the case, and the lymphatic capillary permeability has to do with the unique structure. And so the adjacent endothelial cells that make up the walls of the lymphatic capillaries overlap with each other in such a way to form one-way valves or one-way flaps. And these one-way valves or one-way flaps will actually open up in order to allow interstitial fluid to enter into the lymphatic capillary as lymph. However, when pressure inside the lymphatic capillary builds up, those one-way flaps or valves will close-up so that the lymph cannot leak out of the lymphatic capillary and back into the interstitial space. And the open flaps of the lymphatic capillaries will actually allow relatively large substances to enter into the lymphatic capillaries, And these large substances include large macromolecules, like larger proteins and fat molecules, but also cellular debris, and even pathogens are able to enter as well. And usually, these larger substances are too large to enter into most blood capillaries. So if we take a look at the image down below on the right-hand side, notice that it's zooming into one of these lymphatic capillaries. And what you'll notice is that these endothelial cells that make up the walls of these lymphatic capillaries overlap with each other to create these one-way flaps or valves that, again, can open up. So here we're showing you an open flap. And when these flaps are open, they allow interstitial fluid to enter into the lymphatic capillary as lymph. However, when, again, when pressure builds up inside of the lymphatic capillaries, these one-way valves will actually close up to prevent the lymph from leaving the capillary. And so this ensures that the lymph is going to remain within the capillary and be propelled forward throughout the lymphatic system. Now, what's important to note here is that we have these little brown structures shown, and these brown structures are anchoring proteins to help ensure that these lymphatic capillaries remain in place even when their valves are opening and closing. And so, really, this is the unique structure that allows these lymphatic capillaries to be significantly more permeable than most blood capillaries. So this here concludes our brief video on lymphatic capillaries, and we'll be able to apply these concepts and learn more as we move forward in our course. So I'll see you all in our next video.
Table of contents
- 1. Introduction to Anatomy & Physiology5h 40m
- What is Anatomy & Physiology?20m
- Levels of Organization13m
- Variation in Anatomy & Physiology12m
- Introduction to Organ Systems27m
- Homeostasis9m
- Feedback Loops11m
- Feedback Loops: Negative Feedback19m
- Feedback Loops: Positive Feedback11m
- Anatomical Position7m
- Introduction to Directional Terms3m
- Directional Terms: Up and Down9m
- Directional Terms: Front and Back6m
- Directional Terms: Body Sides12m
- Directional Terms: Limbs6m
- Directional Terms: Depth Within the Body4m
- Introduction to Anatomical Terms for Body Regions3m
- Anatomical Terms for the Head and Neck8m
- Anatomical Terms for the Front of the Trunk8m
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- Review- Using Anatomical Terms and Directions12m
- Abdominopelvic Quadrants and Regions19m
- Anatomical Planes & Sections17m
- Organization of the Body: Body Cavities13m
- Organization of the Body: Serous Membranes14m
- Organization of the Body: Serous Membrane Locations8m
- Organization of the Body: Thoracic Cavity8m
- Organization of the Body: Abdominopelvic Cavity12m
- 2. Cell Chemistry & Cell Components12h 37m
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- 4. Tissues & Histology10h 3m
- Introduction to Tissues & Histology16m
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- Structural Naming of Epithelial Tissue19m
- Simple Epithelial Tissues1h 2m
- Stratified Epithelial Tissues55m
- Identifying Types of Epithelial Tissue32m
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- Introduction to Connective Tissue36m
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- Introduction to Connective Tissue Proper40m
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- Specialized Connective Tissue: Cartilage44m
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- Introduction to Muscle Tissue7m
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- Introduction to Nervous Tissue8m
- Nervous Tissue: The Neuron8m
- 5. Integumentary System2h 20m
- 6. Bones & Skeletal Tissue2h 16m
- An Introduction to Bone and Skeletal Tissue18m
- Gross Anatomy of Bone: Compact and Spongy Bone7m
- Gross Anatomy of Bone: Periosteum and Endosteum11m
- Gross Anatomy of Bone: Bone Marrow8m
- Gross Anatomy of Bone: Short, Flat, and Irregular Bones5m
- Gross Anatomy of Bones - Structure of a Long Bone23m
- Microscopic Anatomy of Bones - Bone Matrix9m
- Microscopic Anatomy of Bones - Bone Cells25m
- Microscopic Anatomy of Bones - The Osteon17m
- Microscopic Anatomy of Bones - Trabeculae9m
- 7. The Skeletal System2h 35m
- 8. Joints2h 17m
- 9. Muscle Tissue2h 33m
- 10. Muscles1h 11m
- 11. Nervous Tissue and Nervous System1h 35m
- 12. The Central Nervous System1h 6m
- 13. The Peripheral Nervous System1h 26m
- Introduction to the Peripheral Nervous System5m
- Organization of Sensory Pathways16m
- Introduction to Sensory Receptors5m
- Sensory Receptor Classification by Modality6m
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- Proprioceptors7m
- Adaptation of Sensory Receptors8m
- Introduction to Reflex Arcs13m
- Reflex Arcs15m
- 14. The Autonomic Nervous System1h 38m
- 15. The Special Senses2h 41m
- 16. The Endocrine System2h 48m
- 17. The Blood1h 22m
- 18. The Heart1h 42m
- 19. The Blood Vessels3h 35m
- 20. The Lymphatic System3h 16m
- 21. The Immune System14h 37m
- Introduction to the Immune System10m
- Introduction to Innate Immunity17m
- Introduction to First-Line Defenses5m
- Physical Barriers in First-Line Defenses: Skin13m
- Physical Barriers in First-Line Defenses: Mucous Membrane9m
- First-Line Defenses: Chemical Barriers24m
- First-Line Defenses: Normal Microbiota7m
- Introduction to Cells of the Immune System15m
- Cells of the Immune System: Granulocytes28m
- Cells of the Immune System: Agranulocytes26m
- Introduction to Cell Communication5m
- Cell Communication: Surface Receptors & Adhesion Molecules16m
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- Introduction to the Complement System24m
- Activation Pathways of the Complement System23m
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- Review of the Complement System13m
- Phagocytosis17m
- Introduction to Inflammation18m
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- Fever8m
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- Review Map of Innate Immunity
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- Antigens12m
- Introduction to T Lymphocytes38m
- Major Histocompatibility Complex Molecules20m
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- Functions of T Lymphocytes25m
- Review of Cytotoxic vs Helper T Cells13m
- Introduction to B Lymphocytes27m
- Antibodies14m
- Classes of Antibodies35m
- Outcomes of Antibody Binding to Antigen15m
- T Dependent & T Independent Antigens21m
- Clonal Selection20m
- Antibody Class Switching17m
- Affinity Maturation14m
- Primary and Secondary Response of Adaptive Immunity21m
- Immune Tolerance28m
- Regulatory T Cells10m
- Natural Killer Cells16m
- Review of Adaptive Immunity25m
- 22. The Respiratory System3h 20m
- 23. The Digestive System2h 5m
- 24. Metabolism and Nutrition4h 0m
- Essential Amino Acids5m
- Lipid Vitamins19m
- Cellular Respiration: Redox Reactions15m
- Introduction to Cellular Respiration22m
- Cellular Respiration: Types of Phosphorylation14m
- Cellular Respiration: Glycolysis19m
- Cellular Respiration: Pyruvate Oxidation8m
- Cellular Respiration: Krebs Cycle16m
- Cellular Respiration: Electron Transport Chain14m
- Cellular Respiration: Chemiosmosis7m
- Review of Aerobic Cellular Respiration18m
- Fermentation & Anaerobic Respiration23m
- Gluconeogenesis16m
- Fatty Acid Oxidation20m
- Amino Acid Oxidation17m
- 25. The Urinary System2h 39m
- 26. Fluid and Electrolyte Balance, Acid Base Balance Coming soon
- 27. The Reproductive System2h 5m
- 28. Human Development1h 21m
- 29. Heredity Coming soon
20. The Lymphatic System
Lymphatic Vasculature
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