Fluid Connective Tissue (OpenStax Anatomy and Physiology)
Blood and lymph are fluid connective tissues. Cells circulate in a liquid extracellular matrix. The formed elements circulating in blood are all derived from hematopoietic stem cells located in bone marrow. Erythrocytes, red blood cells, transport oxygen and some carbon dioxide. Leukocytes, white blood cells, are responsible for defending against potentially harmful microorganisms or molecules. Platelets are cell fragments involved in blood clotting. Some white blood cells have the ability to cross the endothelial layer that lines blood vessels and enter adjacent tissues. Nutrients, salts, and wastes are dissolved in the liquid matrix and transported through the body.What are red blood cells? Red blood cells, also referred to as red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes (from Greek erythros for “red” and kytos for “hollow vessel”, with -cyte translated as “cell” in modern usage), are the most common type of blood cell and the vertebrate’s principal means of delivering oxygen to the body tissues—via blood flow through the circulatory system.
What are platelets? Platelets, also called thrombocytes, are a component of blood whose function (along with the coagulation factors) is to react to bleeding from blood vessel injury by clumping, thereby initiating a blood clot.
Lymph contains a liquid matrix and white blood cells. Lymphatic capillaries are extremely permeable, allowing larger molecules and excess fluid from interstitial spaces to enter the lymphatic vessels. Lymph drains into blood vessels, delivering molecules to the blood that could not otherwise directly enter the bloodstream. In this way, specialized lymphatic capillaries transport absorbed fats away from the intestine and deliver these molecules to the blood.What is lymph? Lymph (from Latin, lympha meaning “water”) is the fluid that flows through the lymphatic system, a system composed of lymph vessels (channels) and intervening lymph nodes whose function, like the venous system, is to return fluid from the tissues to the central circulation.
Betts, J. G., Young, K. A., Wise, J. A., Johnson, E., Poe, B., Kruse, D. H., … DeSaix, P. (n.d.). Anatomy and Physiology. Houston, Texas: OpenStax. Access for free at: https://openstax.org/details/books/anatomy-and-physiology
Vinay Kumar; Abul K. Abbas; Nelson Fausto; Richard N. Mitchell (2007). Robbins Basic Pathology (8th ed.). Saunders.
Laki K (December 1972). “Our ancient heritage in blood clotting and some of its consequences”. Annals of the New York Academy of Sciences. 202 (1): 297–307. Bibcode:1972NYASA.202..297L. doi:10.1111/j.1749-6632.1972.tb16342.x. PMID 4508929.
Related External Link: Substance P and Chronic Pain in Patients with Chronic Inflammation of Connective Tissue
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