Lab Flashcards
(133 cards)
Histology
The study of tissues
Tissue
Group of similar cells performing a common activity
Organ
Group of tissues collectively performing a specific function
Organ System
Group of organs performing a major body function
Four types of Animal Tissues
Epithelial, connective, muscle, nervous
Epithelial tissue
Te covering or lining of free body surfaces, both internal and external
Epithelial Tissue Functions
Protection, absorption, secretion, lubrication, barrier
Apical or Luminal Surface
Free surface of the tissue is exposed to air (skin) or fluid (stomach)
Type of Epithelial Tissues
Simple Squamous Simple Cuboidal Simple Columnar Psuedostratified ciliated columnar Non-Keratinized stratified squamous Keratinized stratified squamous
Simple Squamous Location
Kidneys, lining of body cavities, blood vessels, lymphatic vessels, and heart. Also forms the entire wall of capillaries and the alveoli of the lungs
Simple Squamous Function
Exchange of materials by diffusion
Simple Cuboidal Location
Kidney’s Nephron Tubules
Simple Cuboidal Function
Secretion and absorption
Simple Columnar Location
Walls of villi in small intestine
Simple Columnar Function
Absorption of nutrients, secretion of digestive juices as well as secretion of mucus by goblet cells
Goblet Cells
- Oval cells scattered throughout the epithelium
- Secrete mucus into the respiratory tree
- Trap foreign material with mucus
Microvilli
increase the surface area for absorption of nutrients
What are the two types of stratified squamous epithelium
Non-Keratinized & Keratinized
Non-Keratinized (Wet) Squamous Location
Places subjected to abrasion, moist areas on the body
Oral cavity, pharynx, esophagus, vagina, and anus
Non-Keratinized (Wet) Squamous Function
Protect against abrasion and pathogens to underlying tissues
Keratinized (dry) Squamous Function
Waterproof and microbe-proof barrier
Keratinized (dry) Squamous Location
Dry surfaces, such as the surface of the skin. Composes the epidermis
Thick is found on the surface of the soles of your feet and on the surface of your palms, thin is found everywhere else on the surface of the skin of your body
Pseudostratified Ciliated Columnar Epithelium Location
Lines the nasal cavity, trachea, and bronchi
Pseudostratified Ciliated Columnar Epithelium Function
To protect structures, secrete mucus by goblet cells, and move mucus by cilia