Chapter 38- Intro and Tissues Flashcards
What is the difference between anatomy and physiology?
anatomy studies the structure while physiology studies their function
What are the 5 things individual animal cells require?
1) must be surrounded by an aqueous solution that contain ions
2) use organic molecules as an energy source
3) use oxygen in oxidative reactions
4) removal of waste
5) environmental conditions within range
What are the 3 points about multicellular organisms?
1) an internal environment that can supply nutrients, waste removal, and osmotic balance
2) can become large
3) specialization among cells
What are the 5 levels of organization in order of smallest to largest?
cell, tissue, organ, organ system, organism
What are the 4 basic types of animal tissue?
epithelial, connective, muscle, nervous
What is the structure and function of a tissue determined by? (4)
1) properties of the individual cells
2) structure and organization of the cytoskeleton
3) organization of ECM
4) junctions
What are anchoring junctions and where are they commonly found?
form button like spots or belts that weld cells together – found in tissues subject to stretching, such as skin and heart
muscle
What are tight junctions and where are they commonly found? cell type?
seal spaces between cells ex) urinary bladder
between epithelial cells
What are gap junctions and where are they commonly found?
open channels between cells in the same tissue
ex) between muscle cells
What are epithelial tissues?
cover body surfaces and the surfaces of internal organs, and line cavities and ducts within the body
What is the structure of epithelial tissues?
consist of sheet-like layers of cells, usually connected by
tight junctions with little extra cellular matrix (ECM)
between them
What is the apical surface?
epithelium’s outer surface
What is the basal surface?
inner surface of epithelia
What is the basal lamina?
fixes the epithelium to underlying connective tissues
What are the 2 classifications of epithelia?
simple (single layer) and stratified (multiple layers)
What are the 3 shapes of epithelium?
1) squamous (flattened)
2) cuboidal (cube-shaped)
3) columnar (elongated)
What are the 4 principal types of epithelium are found in the body?
1) simple squamous epithelium
2) stratified squamous epithelium
3) cuboidal epithelium
4) columnar epithelium
Where are new cells produced in the skin?
basal layer
Where are stem cells found?
adults (brain, bone marrow, blood vessels, skeletal muscle, and liver) and embryos
What are exocrine glands? examples?
connected to the epithelium by a duct, which empties their secretion at the
epithelial surface (e.g., mucus, saliva, sweat,
earwax, oils, and milk)
What are endocrine glands? examples?
are ductless – they release hormones which are distributed by the
circulatory system (e.g., pituitary gland, adrenal
gland, and thyroid gland)
Key differences between endocrine and exocrine?
presence of duct and use of circulatory system
Which tissue a lot of the times has more ECM
(by weight and volume) than cellular material?
connective tissue
What is the structure in most ECM?
fibrous glycoprotein collagen embedded in a
network of proteoglycans
What is fibronectin?
type of glycoprotein that aids in attachment of cells to ECM and helps hold cells in position
Where might elastin fibers be found?
skin and lungs