Ch 40 Animal Form and Function Flashcards
Tissue
A group of similar cells (and cell products) specialized for performance of a common function
Four basic types of tissue
1) Epithelial
2) Connective
3) Muscular
4) Nervous
Epithelium
A sheet of cells that covers an external or internal surface
Three functions of epithelial tissue
1) Protection
2) Transport
3) Production
Epithelial tissue produces what?
1) Hormones
2) Enzymes
3) Other cellular products
What does epithelial tissue lack?
A direct blood supply
What supports epithelial tissue?
A basement layer of connective tissue
Cuboidal epithelium
Involved in secretion and absorption
Found in lines and small ducts
Simple columnar epithelium
Found in highly absorptive surfaces (intestine)
Cells may have microvilli extending the surface
Pseudostratified columnar epithelium
Usually ciliated
Lining of trachea (respiratory airways)
Stratified squamous epithelium
More than one layer continually produced by the basal layer of cells
Withstand stretching and abrasion as in the mouth
Simple squamous epithelium
Permits diffusion of molecules
Blood vessels and lungs
Loose connective tissue
Fixed and free cells suspended in a thick fluid
Function of loose connective tissue
Binds epithelial tissue to underlying tissue and holds organs in place
Fibrous connective tissue
Densely packed fibers
Function of fibrous connective tissue
Connects muscles and bones (tendons, ligaments)
Functions of connective tissue
1) Binding
2) Support
Connective tissue is composed of what?
1) Cells embedded in a matrix of fibers
2) A thick fluid ground substance
Characteristics of collagen
1) High tensile strength
2) High elastic resilience
Collagen
Most abundant protein in the bodies of animals
Collagen comprises much of what?
Fibers in connective tissues
Skin
Dense, irregular arrangement of collagen
Ligament
Collagen arranged in sheets
Ligaments connect what?
Bone to bone
Tendon
Collagen in a cable-like arrangement
Tendons connect what?
Muscle to bone
Cartilage
Closely-packed fivers in a gel-like matrix