Introduction to Tissues Flashcards
What is a tissue?
A tissue is a group of similar cells that usually have a common embroyonic origin and function together to carry out specialized activities.
Histology?
is the study of tissues.
The four basic tissue types?
- Epithelial tissue
- Connective tissue
- Muscle tissue
- Nervous tissue
Epithelial tissue?
Covers body surfaces; lines hollow organs, body cavities, and ducts; and forms glands.
Connective tissue?
Protects and supports the body and its organs; binds organs together; stores energy reserves as fat; and provides immunity.
Muscle tissue?
Is responsible for movement and generation of force.
Nervous tissue?
Initiates and transmits action potentials (nerve impulses) that help coordinate body activities.
Number of layers of cells?
- Simple- refers to a single layer of cells.
2. Stratified- indicated that there is more one layer of cells.
Shape of cells
- Squamous- indicates the cells are flat or scale-like.
- Cuboidal- indicates the cells are cube-shaped.
- Columnar- indicates the cells are column-shaped.
Simple columnar epithelium
Lines most of the digestive tract, the gallbladder, ducts of many glands, the uterine tubes and uterus.
Stratified squamous epithelium
consist of many layers of cells. It provides protection against physical and chemical abrasion, infection, and water loss from the body.
Skeletal muscle tissues
composes skeletal muscles that are attached to bones throughout the body. These muscles bring about voluntary movement under our conscious.
Cardiac muscle tissue
composed the walls of the heart. It is involuntary muscle since it is not under our conscious control.
Smooth muscle tissue
composed the walls of hollow organs and blood vessels. It is involuntary muscle.
