Chapter 4 A&P Flashcards
What are tissues?
Cells organized into more complex units
What is the study of tissues called?
Histology
Who examines the tissues?
A pathologist
What are the four types of tissues?
- Epithelial
- Connective
- Muscle
- Nervous
What is the superficial tissue?
Epithelial
Which tissue is very diverse?
Connective
What is the muscle tissue for?
Contraction and generation of power movements. Also generates heat for the body.
Which tissue is responsible for electrical signals?
Nervous tissue
Which tissue is tightly packed together (stacked)?
Epithelial
Which tissue is scattered and surrounded by large amounts of extracellular matrix?
Connective
Which tissue lines the body surfaces and cavities?
Epithelial
Where do epithelial cells attach?
Basement membrane
Does Epithelial tissue have a nerve supply?
Yes
True or false: Mitosis rarely occurs in epithelial tissue
False
What is the apical surface?
The exposed surface to external environment
What kind of surface has intercellular junctions?
Lateral surfaces
Which surface is attached to the basement membrane?
Basal surface
Main functions of the epithelial tissue: (4)
- Secretions
- Sensations
- Physical protection
- Selective permeability
How do you name a tissue?
Arrangement of layers and cell shape
What is a “simple” layer?
One row
What is a pseudostratified layer?
One layer that is stretched vertically
When is a layer considered “stratified”?
Two or more layers
What do squamous cells look like?
Flat, widened, thin
Which cells look cube-like?
Cuboidal
Which cells are taller than they are wide?
Columnar
What are the 3 possible types of cell shapes?
- Squamous
- Cuboidal
- Columnar
Where may you find simple epithelium?
Found where filtration, absorption, or secretion primary function
Ex. Lining of air sacs of lungs, intestines, blood vessels
Where are stratified epithelium found?
Found in areas subjected to mechanical stress
Ex. Skin, lining of the pharynx, esophagus
Which epithelium appears layered, but is actually 1 layer?
Hint: “False” layers
Pseudostratified epithelium
What is the nucleus like in squamous cells?
Flattened
What is the nucleus like in cuboidal cells?
Spherical and in center of cell
What is the nucleus like in columnar cells?
Oval
Where is the nucleus in transitional cells?
Occur where epithelium stretches and relaxes
Two main divisions of the glands:
- Endocrine
- Exocrine
What do glands do?
Secrete substances for use elsewhere for elimination