General Biology : Sir Nico's Materials Animal Tissues Flashcards
All connective tissue is derived from an embryonic tissue known as:
Mesenchyme
Epithelial tissues can be classified according to cell shape.
__________________ epithelial cells are scalelike and flattened.
Squamous
All the following are examples of connective tissue except:
a. bones
b. ligaments
c. neurons
d. tendons
C. Neurons
Of the two major cell types found
in nervous tissue, _________ cells are highly specialized to
generate and conduct electrical signals.
Neurons
How many basic types of muscle tissue are there?
Four
connective tissue,
epithelial tissue,
muscle tissue,
nervous tissue
levels of structural organization
Atom > Chemical Composition > Organelles > Cells > Tissues > Organs > Organ System > Organism
is a sheet of cells that covers
a body surface or lines a body cavity. It
Epithelial Tissue
Based on cell shape, epithelia are classified into three
categories:
- Squamous (scalelike)
- Cuboidal (cubelike)
- Columnar (column-shaped)
epithelia consist of one layer of cells attached to the
basement membrane.
Simple
epithelia consist of two or more layers of cells.
Stratified
Supported by connective tissue. The cells are attached to
and supported by an adhesive
Basement Membrane
There are, in addition, two less easily categorized types of
epithelia.
Pseudostratified Epithelium, Transitional Epithelium
is actually a simple columnar
epithelium (one layer of cells), but because its cells vary
in height and the nuclei lie at different levels above the
basement membrane, it gives the false appearance of being
stratified. This epithelium is often ciliated.
Pseudostratified Epithelium
is a rather peculiar stratified squamous epithelium formed of rounded, or “plump,” cells with the ability to slide over one another to allow the organ to be stretched.
Transitional Epithelium
- Single layer of flattened cells
with disc-shaped central nuclei and sparse
cytoplasm; the simplest of the epithelia. - Allows materials to pass by
diffusion and filtration in sites where protection
is not important; secretes lubricating
substances in serosae. - Kidney glomeruli; air sacs of lungs;
lining of heart, blood vessels, and lymphatic
vessels; lining of ventral body cavity (serosae).
Simple squamous epithelium
Single layer of cubelike cells
with large, spherical central nuclei.
Secretion and absorption.
Kidney tubules; ducts and secretory
portions of small glands; ovary surface.
Simple cuboidal epithelium