This document discusses the four main types of tissues - epithelial, connective, muscle and nerve tissue. It focuses on epithelial tissue, describing the different classifications of epithelia including simple, stratified, squamous, cuboidal, columnar and transitional epithelia. Glands are classified as endocrine or exocrine, with exocrine glands such as mucous, sweat and salivary glands secreting their products onto surfaces or into cavities. Multicellular exocrine glands contain ducts and secretory units and can be further classified by duct structure and secretory unit type.
A power point presentation made with hard work, collecting material from various authentic and reliable sources. Best ppt for under grad as well as for post grad students.
A power point presentation made with hard work, collecting material from various authentic and reliable sources. Best ppt for under grad as well as for post grad students.
Categories of Tissues
Epithelium
Connective
Muscle
Nervous
Epithelium
Lines, covers, and protects other tissues and organs.
Characterized by:
Cells tightly junked together
The presence of a cell secretion called the basement membrane.
Named by:
Cell shape
Other characteristics of the cells.
Squamous, Cuboidal, and Columnar
Cuboidal Epithelium
Cells cube shaped- secretion and absorption.
Kidney tubules
Duct and small glands
Surface of ovary
Connective Tissue
Characterized by the cells widely separated from each other in a matrix that is produced by the cells.
Tissue protects and supports.
Cell Matrix composed of two regions
Ground
Liquid (sol), Gel, Gum or solid
Fibers
Non-elastic (= white or Collagen)
Elastic (= yellow fibers)
Types of Connective tissue
Tissues = groups of cells that are similar in structure and function.
Protection Skin protects from sunlight & bacteria & physical damage.AbsorptionLining of small intestine, absorbing nutrients into bloodFiltrationLining of Kidney tubules filtering wastes from blood plasmaSecretionDifferent glands produce perspiration, oil, digestive enzymes and mucus
A tissue is a group of connected cells that have a similar function within an organism. There are four basic types of tissue in the body of all animals, including the human body. These make up all the organs, structures and other contents of the body.
Categories of Tissues
Epithelium
Connective
Muscle
Nervous
Epithelium
Lines, covers, and protects other tissues and organs.
Characterized by:
Cells tightly junked together
The presence of a cell secretion called the basement membrane.
Named by:
Cell shape
Other characteristics of the cells.
Squamous, Cuboidal, and Columnar
Cuboidal Epithelium
Cells cube shaped- secretion and absorption.
Kidney tubules
Duct and small glands
Surface of ovary
Connective Tissue
Characterized by the cells widely separated from each other in a matrix that is produced by the cells.
Tissue protects and supports.
Cell Matrix composed of two regions
Ground
Liquid (sol), Gel, Gum or solid
Fibers
Non-elastic (= white or Collagen)
Elastic (= yellow fibers)
Types of Connective tissue
Tissues = groups of cells that are similar in structure and function.
Protection Skin protects from sunlight & bacteria & physical damage.AbsorptionLining of small intestine, absorbing nutrients into bloodFiltrationLining of Kidney tubules filtering wastes from blood plasmaSecretionDifferent glands produce perspiration, oil, digestive enzymes and mucus
A tissue is a group of connected cells that have a similar function within an organism. There are four basic types of tissue in the body of all animals, including the human body. These make up all the organs, structures and other contents of the body.
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Epithelial Tissue
General Characteristics:
- Found throughout the body, covers all
body surfaces both inside and out.
- Main glandular tissue.
- Attached to underlying connective tissue
by noncellular nonliving basement
membrane.
- Usually has no vascular tissue - blood
supply
- Cells reproduce rapidly (rapid healing).
introduction to tissues-human body is made up of 4 basic tissues- connective tissues, epithelium tissue, nervous tissue, muscular tissue--biological tissues is a collection of interconnected cells that perform a similar function and an embryological origin with similar structure , types of tissues , microscopic diagram, diagrams of tissues, epithelial tissue and types, connective tissue , its components and types
Types of tissues with characteristic's and distribution regions
Epithelial tissue is a type of tissue that covers the surfaces of organs, lines body cavities and forms glands. This PDF provides a comprehensive overview of epithelial tissue, including its types, structure, function, and location in the body. The document covers the different types of epithelial cells, their shapes, and layers, as well as their functions in different organs and tissues. The PDF also delves into the unique features of epithelial tissue, such as its polarity, cell junctions, and the basement membrane. Additionally, Whether you are a student, medical professional, or someone interested in learning about the human body, this PDF provides a detailed understanding of epithelial tissue and its importance in the body.
1. 4Tissue: The Living Fabric
Tissues
* Groups of cells similar in structure and function
* The four types of tissues
* Epithelial
* Connective
* Muscle
* Nerve
Epithelial Tissue
* Cellularity – composed almost entirely of cells
* Special contacts – form continuous sheets held together by tight
junctions and desmosomes
* Polarity – apical and basal surfaces
Epithelial Tissue
* Supported by connective tissue – reticular and basal laminae
* Avascular but innervated – contains no blood vessels but supplied by
nerve fibers
* Regenerative – rapidly replaces lost cells by cell division
2. Classification of Epithelia
* Simple or stratified
Classification of Epithelia
* Squamous, cuboidal, or columnar
Epithelia: Simple Squamous
* Single layer of flattened cells with disc-shaped nuclei and sparse
cytoplasm
* Functions
* Diffusion and filtration
* Provide a slick, friction-reducing lining in lymphatic and
cardiovascular systems
* Present in the kidney glomeruli, lining of heart, blood vessels,
lymphatic vessels, and serosae
Epithelia: Simple Squamous
Epithelia: Simple Cuboidal
* Single layer of cube-like cells with large, spherical central nuclei
* Function in secretion and absorption
* Present in kidney tubules, ducts and secretory portions of small
glands, and ovary surface
Epithelia: Simple Cuboidal
Epithelia: Simple Columnar
* Single layer of tall cells with oval nuclei; many contain cilia
* Goblet cells are often found in this layer
* Function in absorption and secretion
3. * Nonciliated type line digestive tract and gallbladder
* Ciliated type line small bronchi, uterine tubes, and some regions of the uterus
* Cilia help move substances through internal passageways
Epithelia: Simple Columnar
Epithelia: Pseudostratified Columnar
* Single layer of cells with different heights; some do not reach the free
surface
* Nuclei are seen at different layers
* Function in secretion and propulsion of mucus
* Present in the male sperm-carrying ducts (nonciliated) and trachea
(ciliated)
Epithelia: Pseudostratified Columnar
Epithelia: Stratified Squamous
* Thick membrane composed of several layers of cells
* Function in protection of underlying areas subjected to abrasion
* Forms the external part of the skin’s epidermis (keratinized cells), and
linings of the esophagus, mouth, and vagina (nonkeratinized cells)
Epithelia: Stratified Squamous
Epithelia: Stratified Cuboidal and Columnar
* Stratified cuboidal
* Quite rare in the body
* Found in some sweat and mammary glands
* Typically two cell layers thick
4. Epithelia: Stratified Cuboidal and Columnar
* Stratified columnar
* Limited distribution in the body
* Found in the pharynx, male urethra, and lining some glandular ducts
* Also occurs at transition areas between two other types of epithelia
Epithelia: Transitional
* Several cell layers, basal cells are cuboidal, surface cells are dome
shaped
* Stretches to permit the distension of the urinary bladder
* Lines the urinary bladder, ureters, and part of the urethra
Epithelia: Transitional
Epithelia: Glandular
* A gland is one or more cells that makes and secretes an aqueous fluid
* Classified by:
* Site of product release – endocrine or exocrine
* Relative number of cells forming the gland – unicellular or
multicellular
Endocrine Glands
* Ductless glands that produce hormones
* Secretions include amino acids, proteins, glycoproteins, and steroids
Exocrine Glands
*More numerous than endocrine glands
* Secrete their products onto body surfaces (skin) or into body cavities
5. * Examples include mucous, sweat, oil, and salivary glands
* The only important unicellular gland is the goblet cell
*Multicellular exocrine glands are composed of a duct and secretory
unit
Multicellular Exocrine Glands
* Classified according to:
* Simple or compound duct type
* Structure of their secretory units
Goblet Cell
Structural Classification of Multicellular Exocrine Glands
Structural Classification of Multicellular Exocrine Glands
6. * Examples include mucous, sweat, oil, and salivary glands
* The only important unicellular gland is the goblet cell
*Multicellular exocrine glands are composed of a duct and secretory
unit
Multicellular Exocrine Glands
* Classified according to:
* Simple or compound duct type
* Structure of their secretory units
Goblet Cell
Structural Classification of Multicellular Exocrine Glands
Structural Classification of Multicellular Exocrine Glands