Lec Test 1 CH5 Flashcards
relatively undifferentiated cells that grow into a new type of cell
Stem cells
What are the four main types of tissue
Epithelial, connective, muscle, nervous
What are the functions of epithelial tissue
Covers body and organ surfaces, lines body and organ cavities, forms some glands
process by which a less specialized cell becomes a more specialized cell type
differentiation
the top of the tissue, exposed to the external environment
Apical surface
tissue surface attached to the underlying tissue
Basal surface
another term for stem cells
Mesenchymal cells
state of epithelial tissue where they have no direct blood supply
Avascularity
Characteristic of epithelial tissue that describes their ability to continuously replace itself
High regeneration capacity
hold epithelial cells together
Epithelial junctions
junction close to the surface, hold cells together at the surface
Tight junctions
junction that hold cells together at the middle and bottom
Desmosomes
junctions that connect cells and make a tube from one cell to the next
Gap junctions
feature of epithelial tissue that secretes substances
glands
type of glands that make things that are used inside the body and lack ducts, eg hormones
Endocrine glands
type of glands that make things use outside the body and have ducts, eg sweat and mammary glands
Exocrine glands
Three types of glands by method of secretion
Merocrine, Apocrine, Holocrine
glands that make vesicles with watery secretions, cell is not damaged, eg tears, spit, some sweat
Merocrine
glands that make milky secretions, cell is damaged but doesn’t die, eg mammary glands, axillary sweat glands
Apocrine
glands that produce oily secretions, cell is damaged and dies, eg sebaceous glands
Holocrine
type of tissue that lines the stomach
simple columnar epithelium
connective tissue in walls of stomach
Areolar and dense
type of muscle in walls of stomach
smooth muscle
4 types of membranes
Mucous, Serous, Cutaneous, Synovial
type of membrane that produces mucus
Mucous membrane
type of membrane that creates serous fluids that lubricate opposing surfaces
Serous membranes
Where are mucus membranes found
found in areas that connect to outside
Where are serous membranes found
in body cavities that connect to the outside
type of membrane that produces sweat
Cutaneous membrane
Where is the cutaneous membrane found
the skin
type of membrane that creates synovial fluid which lubricate joints
Synovial membrane
Where is the synovial membrane found
in the joints
change in type of cell
Metaplasia
What is happening when smoking changes trachea from pseudostratified columnar epithelium to nonkeratinized stratified squamous epithelium
metaplasia
increase in size of cells of existing tissue
Hypertrophy
increase in the number of cells of a tissue
Hyperplasia
tumor or abnormal growth of cells in tissue
Neoplasia
decrease in size or number of existing cells
Atrophy
term for tissue death
Necrosis
Five Changes to aging tissues
Cells get smaller Cells get fewer Cells don’t work as well Cells don’t repair/replace as well Cells die
3 characteristics of epithelial tissues
Cellularity, Polarity, Attachment to a basement membrane
epithelial tissue is composed almost entirely of tightly packed cells
Cellularity
epithelium has an apical surface exposed to the external environment or internal body space
Polarity
epithelial layer is bound at its basal layer to a basement membrane as a molecular barrier and to strengthen the bond to underlying connective tissue
Attachment to a basement membrane
A thin layer of connective tissue underlying the epithelium that is a molecular barrier and strengthens the attachment to underlying connective tissue
basement membrane
3 layers associated with the basement membrane
Lamina lucida, lamina desa, and reticular lamina
a glycoprotein constituent of mucus
mucin
Substances that dissolve in water and readily conduct electrical current
electrolytes
Clusters of cells that produce a secretion and one or more ducts
acini
Unicellular glands that secrete mucin
goblet cell
glands that have a single unbranched duct
simple glands
glands that have branched ducts
compounds glands
tissue that lacks an apical surface; it is the most diverse, abundant, and widely distributed form of tissue
Connective tissue
3 classifications of connective tissue
Connective tissue proper, supporting connective tissue, fluid connective tissue
6 functions of connective tissue
Physical protection, Support and structural framework, binding of structures, storage, transport, immune protection
bones of the skull and thoracic cage protect delicate organs, adipose tissue cushions organs
Physical protection
bones serve as the framework for the body, keep airways open, and provide supportive capsules around kidney and spleen
Support and structural framework
Ligaments bind bone to bone; tendons muscle to bone; connective tissue skin to underlying muscle and bone
Binding of structures
adipose tissue stores energy, bones store calcium and phosphorus
Storage
blood carries gasses, nutrients, and wastes
Transport
contains leukocytes and other immune cells
Immune protection
Necrosis of soft tissue due to restricted arterial blood flow
gangrene
necrosis of the intestine due to an obstruction that restricts blood flow to the intestines
Intestinal gangrene
usually occurs when a body part is desiccated, and blood supply is constricted, eg complication of frostbite
Dry gangrene
caused by bacterial infection of tissues that have lost their blood supply
Wet gangrene
usually in muscle tissue, gas is caused by bacteria clostridium, which invade necrotic tissue and produce gas
Gas gangrene
Support, maintenance, and replacement of cells and extracellular matrix becomes less efficient. Epithelia becomes thinner; tissue repair takes longer; bones become brittle; muscle and nervous tissue atrophies
changes that occur to tissues as we age