Chapter 4 Flashcards
Extra cellular matrix
The noncellular substances surrounding the cells
4 tissue types
Epithelial
Connective
Nervous
Muscle
The 2 most diverse kinds of tissue and why
Epithelial and connective,
they are classified by structure
Including cell shapes, relationships of cells to one another, and materials making up the ECM
What tissue types are classified by functional and structural characteristics
Muscle and nervous
Histology
Is the microscopic study of tissues
Biopsy
The process of removing tissue sample for further examination and clinical diagnosis
Autopsy
Is an examination of the organs of a cadaver in order to determine the COD or study the changes caused by disease
The 3 embryonic tissue layers (germ layers) and location and example
Endoderm- inner layer (digestive tract & derivatives)
Mesoderm- middle layer ( muscle bone and blood vessels)
Ectoderm- outer layer ( skin)
Neuroectoderm
A portion of the ectoderm that becomes the nervous system
Neural crest cells
Give rise to parts of the peripheral nerves, skin pigment, tissues of the face, medulla of the adrenal gland
Apical surface
Not attached to other cells
Basement membrane
A specialized type of extra cellular material that is secreted by the epithelial cells and by connective tissue cells.
It is the scotch tape that helps attach epithelial cells to underlying tissues
Functions of epithelia
Protecting underlying structures Acting as barriers Permitting the passage of substances Secreting substances Absorbing substances
Simple epithelium
Consists of a single layer of cells , with each extending from the basement membrane to the free surface
Stratified epithelium
Consists of more than one layer of cells, only the basal layer touches the basement membrane
Pseudo stratified columnar
Appears to be stratified but the long columnar cells are really just pressed close together giving a stratified effect
Squamous
Cells are flat or scalelike
Cuboidal
Cells are cube-shaped; about as wide as they are tall
Columnar
Cells are taller than they are wide
Nonkeratinized stratified squamous epithelium
Found in areas such as the mouth, esophagus, rectum, and vagina, consists of living cells in the deepest and outermost layers.
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Keratinized stratified squamous epithelium
Found in layers of the skin, consists of living cells in the deepest layers and the outer layers are dead cells containing the protein keratin
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Transitional epithelium
Urinary bladder, ureters, pelvis of the kidney.
The shape and number of cell layers vary, depending on whether the transitional epithelium is stretched or or not.
Function: accommodates fluctuations in the volume of fluid, protection against the caustic effects of urine
Pseudostratified columnar epithelium
Single layer of cells, appears to be multiple layers but is only one.
Ex: Nasal cavity and sinuses, auditory tubes, pharynx, trachea, and bronchi
Function: secretes mucus, ciliates tissue moves mucus
Stratified columnar
Multiple layers of cells with tall, thin cells resting on layers of more cuboidal cells.
Function: protection and secretion
Location: mammary gland duct, larynx, a portion of the male urethra
Stratified cuboidal epithelium
Multiple layers of cube shaped cells
Function: secretion, absorption, and protection against infection.
Location: sweat gland ducts, ovarian follicular cells, and salivary gland ducts
Stratified epithelium
Multiple layers of flat cells
Lines the esophagus, mouth, and vagina, makes up skin
Function: protects against abrasion.
Simple columnar epithelium
Ciliated tissues are in bronchi, uterine tubes, and uterus, smooth(non ciliates tissues) are in the digestive tract, bladder.
Function: absorbs, it also secretes mucous and enzymes
Simple cuboidal
Single layer of cube like cells, in ducts and secretory portions of small glands in kidney tubules
Function: secrete and absorbs
Simple squamous epithelium
Single layer of Very thin cells, alveoli, lining of the heart, blood vessels, and lymphatic vessels
Goblet cells
Specialized columnar epithelial cells, responsible for synthesis and secretion of mucus
Desmosomes
Disk shaped structures with especially adhesive glycoproteins that bind cells to one another and intermediate filaments that extend into the cytoplasm of the cell.
Tight junctions
Hold cells together and form a permeability barrier
Made up of zonula adherens and zonula occludens
Zonula adherens
Located between the plasma membranes of adjacent cells and acts like weak glue that holds cells together
Zonula occludens
Forms a permeability barrier. Formed by plasma mebranes of adjacent cells that join one another in a jigsaw fashion to form a tight seal
Gap junction
Specialized contact region between cells with protein channels that aid intercellular communication.
Intercalated discs
Gap junctions between cardiac muscle cells are found in specialized cell-to-cell connections called intercalated discs
Exocrine glands
Glands with ducts lined with epithelium
Endocrine glands
Glands that have no ducts and extensive blood vessels in the connective tissue of the glands
Hormones
Cellular products of endocrine glands, secreted into the blood stream and are carried throughout the body
Multicellular glands
Exocrine glands composed of many cells
Unicellular glands
Exocrine glands composed of a single cells
Tubules
Small tubes, all glands originate from one tubule
Acini or alveoli
Sac like structures
Merocrine glands
Secrete products with no loss of actual cellular material
Apocrine glands
Discharge fragments of the gland cells in the secretion
Holocrine glands
Shed entire cells
Blasts
Create the matrix