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4 basic types of tissues Epithelial , connective, muscle, and nervous
Epithelial tissue structure Avascular Closely packed with no intercellular material Always has free surface outside or internal space Anchored to connective tissue by basement membrane (non-living)
Epithelial tissue function Covers all free body surfaces and organs Inner lining of body cavities Lines hollow organs Forms skin and glands
Simple Squamous Single layer Flat, scale-like cells Diffusion, osmosis, and filtration Lines the heart vessels - endothelium Lines body cavities - mesothelium
Simple Cuboidal Single layer Cube shaped cells Secretion and absorption Covers ovaries, lines ducts of glands, and tubules of kidneys Lumen
Simple Columnar Single layer, elongated cells Secretion and absorption Nucleus near b.m. Lined gallbladder and digestive system Goblet cells Microvilli
Pseudo stratified Columnar (Ciliated) Appears stratified but it is not Nuclei depth varies Secretion and movement Attached to base membrane but may not reach free surface Goblet cells Cilia: hair-like structures Upper respiratory and reproductive system
Stratified Squamous Several layers Surface is older and flat Deep younger and cube or elongated Functions for protection in areas that have wear and tear Keratinized SS contains keratin for waterproofing - Skin Nonkeratinized SS lines wet surfaces, mouth, esophagus
Nerve Tissue Found in Brain, spinal cord, and nerves Neurons: nerve cells 3 parts of the neuron Cell body: nucleus Axon: impulse away Dendrite: impulse toward Neuroglial cells: nourish and support neurons Functions - nerve impulse transmission
Tissues 2 Connective tissues Characteristics: bind, support and protect, store fat, produce blood cells, with an intercellular matrix, vascular (usually)
Adipose Adipocyte Stores fat Nucleus is pushed against cell membrane Serves as heat insulator and energy reserve Located beneath the skin, behind the eye, surrounding organs
Loose Connective (Areolar) Forms fragile membranes in body Binds skin to underlying organs and fills spaces between the muscles Collagenous (White Fibers) Elastic (Yellow Fibers) Fibroblasts, mast cells, plasma cells, macrophage cells
Bone (Osseous) Most rigid Protects, supports, muscle attachment, blood cell formation, stores minerals Osteocytes in lacunae Lamella matrix of Ca, P, and protein Haversian Canal Canaliculi
Hyaline Cartilage Chondrocytes in lacunae Perichondrium: fibrous connective tissue that covers and nourishes Ends of bones, nose, walls of respiratory passages
Muscles Characteristics Tissues is made of elongated cells called fibers Plasma membrane =sarcolemma Cytoplasm = sarcoplasm Excitability = receive and respond to stimuli Contractility: shorten Extensibility: stretch Elasticity: return to original shape
skeletal Attached to bone Voluntary: controlled by conscious effort Function: Voluntary mov’t of the skeleton Striations: bands of color Multinucleated
smooth Found in walls of hollow organs Involuntary No striations Single nucleus Function: Peristalsis: mov’t of food through the body
Cardiac Found only in heart Cardiac cells are joined by intercalated discs: gives strength & endurance Involuntary Striations Single nucleus
Created by: 2448876625386153