The Tissue Level of Organization

These flashcards cover key concepts related to the tissue level of organization, focusing on definitions, functions, characteristics, and classifications of various tissue types.

What are the four major types of tissues in the body?

Epithelial, Connective, Muscle, Nervous.

What is histology?

The study of tissues.

What are the main functions of epithelial tissue?

Provide protection, control permeability, provide sensation, and produce specialized secretions.

What characterizes epithelial tissue?

Polarity, cellularity, attachment, avascularity, and regeneration.

What are the types of cell junctions in epithelial tissue?

Gap junctions, tight junctions, and desmosomes.

What distinguishes simple squamous epithelium?

It is the most delicate type of epithelium, primarily involved in absorption and diffusion.

What is the function of stratified squamous epithelium?

Provides physical protection against mechanical stresses.

What are the characteristics of cuboidal epithelia?

Simple cuboidal epithelia are involved in secretion and absorption; stratified cuboidal epithelium is rare, found in certain ducts.

Where is transitional epithelium found, and what is its function?

Found in the urinary bladder, it permits cycles of stretching without damage.

What is the function of columnar epithelia?

Involved in absorption and secretion, typically found in the digestive tract.

How does age affect tissues in the body?

Aging can lead to decreased ability to regenerate and increased risk of injury.

What is the role of stem cells in epithelial maintenance and repair?

Stem cells located near the basement membrane divide to replace lost epithelial cells.