Tissues - Ch.4 Flashcards
What are the 4 types of tissue in the body?
- Epithelial
- Connective
- Nervous
- Muscle
Epithelial Tissue
Sheets of cell that cover a body surface or cavity or make up glands
Lining Epithelium
Epithelial tissues that makes up skin and that lines cardiovascular, digestive, and respiratory cavities
Glandular Epithelium
Epithelial tissues that make up glands
5 Special Characteristics of Epithelial tissues
- Polarity
- Specialized contacts
- Supported by connective tissues
- Avascular but innervated
- Regenerate
Simple Squamous
Single layer of flat cells (found in lung air sacs, blood vessels, lymphatic vessels)
Simple Cuboidal
Single Layer of cube-like cells (found in Kidney tubules, ducts of small glands, and ovary surface)
Simple Columnar
Single layer of column-like cells (found in Digestive tract, gallbladder, uterine tubes, parts of uterus)
Pseudostratified Columnar
Columnar cells of varying heights (found in ducts of large glands and the trachea)
Stratified Squamous
Multi-layered flat cells (lines esophagus, mouth, and vagina and makes up the epidermis of skin
Transitional
Cells that are varied in shape and can expand and contract (Lines uterus, urinary bladder, and part of the urethra)
Endocrine Glands
Release hormones, ductless, exocytosis directly into blood
Exocrine glands
Release sweat, oils, saliva, and bile, have ducts, Merocrine or Holocrine releases
Merocrine
Releasing of cell contents through exocytosis
Holocrine
Releasing of cell contents by the cell rupturing