e macrophages neutrophils ii Loose Connective Tissue Areolar Connective Tissue

E macrophages neutrophils ii loose connective tissue

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– ingest foreign substances, endocytosis (i.e. macrophages, neutrophils) ii. Loose Connective Tissue / Areolar Connective Tissue 1. Deep to epithelium, lines membranes and body cavities 2. Gives blood and nutrients to epithelium, has immune cells to prevent invaders 3. Mostly ground substance iii. Dense Connective Tissue 1. Mostly protein fibers, provides strength and support 2. D ense irregular – mostly collagen fibers; dermis and joints 3. Dense regular collagenous – parallel collagen fibers; resist tension in one plane; tendons and ligaments 4. Dense regular elastic – parallel collagen with randomly orients collagen, allows for stretching; large blood vessels, spine ligaments iv. Reticular Tissue 1. Mostly reticular fibers, forms networks that support small structures and trap old and foreign cells 2. Forms internal structure of many organs 3. Blood vessels , lymphatic vessels, lymph nodes, spleen, basement membrane, bone marrow v. Adipose Tissue 1. Insulation, warmth, protection, energy storage 2. White adipose (subcutaneous fat, visceral fat) vs. brown adipose d. Specialized Connective Tissue i. Cartilage 1. Tough, flexible, resistant to tension and compression 2. Chondroblasts – immature cells, divide and make ECM 3. Chondrocytes – mature cells, relatively inactive 4. Perichondrium – outer sheath of dense irregular collagenous that provides oxygen and blood to the cartilage 5. Hyaline cartilage – Mostly ground substance, found at joints 6. Fibrocartilage – Mostly collagen fibers. Fibrous joints (vertebrae) 7. Elastic cartilage – Elastic fibers, external ear and larynx ii. Bone 1. Bone tissue = osseous tissue
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Chapter 4 - Histology 2. Supports body, protects organs, connects muscle to allow movement, houses bone marrow. 3. Hemopoiesis – blood cell formation 4. ECM is two things: collagen fibers and osteoid (ground) + calcium phosphate crystals 5. Osteoblasts (form new bone), osteocytes (bone maintenance), osteoclasts (bone destroyers) iii. Blood 1. ECM is called plasma (water, solutes, protein) 2. Erythrocytes – red blood cells, carry oxygen 3. Leukocytes – white blood cells, immunity 4. Thrombocytes - Platelets, blood clotting V) Muscle Tissue a. Myocytes – muscle cells, are excitable cells; cytoplasm is filled with myofilament b. Striated muscle cells – have some regions where myofilaments overlap, cells look dark under a microscope, alternating light and dark regions are called striations .
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