Lesson 4: Animal and Plant Tissues Flashcards
individual cells arranged into groups that function collectively
tissues
composed of similar cells performing the same funcions
Tissues in turn are combined into?
organs
organs are combined into?
organ systems
Animal tissues are generally classified into four types:
- epithelial
- connective
- muscular
- nervous
- consist of sheets of cells that cover organisms and their organs
- also form glands that synthesize secretory products for discharge into their environment
epithelial tissues
examples of glands formed by epithelial tissues:
- sebaceous glands
- salivary glands
all epithelial tissue usualy adhere tightly to the similar cells on either side of them througj cell-to-cell juntions called
tight junctions
seals off a tissue from adjacent open spaces and prevent the entrance of disease-causing microorganisms
tight junctions
epithelial tissues can be classified according to :
- number of cell layers (simple or stratified)
- cell shape (squamous, cuboidal, columnar)
- surface specialization (cilia, keratin, goblet, or brush border
Types of Epithelial Tissues in Terms of their Structure:
- Simple epithelium
- Stratified epithelium
is made up of only one layer of cells, and according to cell shape, can be squamous, cuboidal or columnar
Simple epithelium
is made of more than one layer of cells. According to the shape of its top-most layer, this can be classified as squamous, cuboidal, columnar, transitional, or pseudostratified
stratified epithelium
they connect and bind parts together just like the Achillles tendons found in your legs
Connective Tissues
examples of connective tissues that we often encounter while eating chicken are
ligaments and tendons
tissue that usually bind a muscle to a bone
tendons
tissues that connect a bone to another bone
ligaments
its most common types are the areolar tissue, fibrous tissue, adipose tissue, bone, cartilage and blood
connective tissue
is considered a supportive tissue since its primary function is to supply the body with nutrients and gases it needs
Blood
types of connective tissues:
- collagenous
- reticular
- elastic
is predominantly made up of type I collagen
collagenous connective tissue
e.g. dense regular connective tissues in the tendons, and dense irregular connective tssues in periosteum
- primarily formed by type III collagen, a protein found in bones and cartilage,
- is commonly found as a supportive framework of hematopoietic and lymphold organs
reticular connective tissue
e.g. adipose tissue, baal lamina, animal stroma of glandular organs
primarily formed by type II collagen, a component of joint cartilage, contains retractile fibers with elastin
elastic connective tissue
not easily visualized unless it is stained. Found in the bronchi, trachea, blood vessels, and hollow organs