Epithelial and Connective Tissues Integrated Study Guide

Flashcards testing core concepts of Epithelial and Connective Tissues, including structural features, cell shapes, body membranes, fibers, repair processes, aging effects, and tissue comparison.

What is the definition of a tissue in anatomy and physiology?

A group of similar cells performing a shared function.

What is histology?

The microscopic study of tissues.

Why are tissue injury, inflammation, and repair clinically relevant?

They are central to wound care, burns, pressure injuries, and chronic disease.

What are the key structural features of epithelial tissue?

High cellularity (cells tightly packed with minimal extracellular matrix), avascularity (no blood vessels; nutrients diffuse from underlying connective tissue), polarity (apical exposed surface and basal surface attached to basement membrane), and a high regeneration rate.

What is the function and an example location of tight junctions?

They seal between cells to prevent leakage; found in the gastrointestinal tract and urinary bladder.

What is the function and an example location of gap junctions?

They are protein channels allowing ion flow to coordinate electrical activity; found in cardiac muscle.

What is the role and an example location of anchoring junctions (desmosomes)?

They provide mechanical stability and resist stress; found in the skin.

How are epithelial cell shapes classified and what are their specific functions?

Squamous cells are thin and flat (allow diffusion and filtration); Cuboidal cells are cube-shaped (support secretion and absorption); Columnar cells are tall (specialized for absorption and protection).

What is the structural and functional difference between simple and stratified epithelium?

Simple epithelium has one layer and supports absorption and diffusion, while stratified epithelium has multiple layers and provides protection.

How do exocrine glands and endocrine glands differ in secretion method and examples?

Exocrine glands secrete into ducts (e.g., sweat, saliva, mucus), whereas endocrine glands secrete hormones into the bloodstream (e.g., thyroid, adrenal).

What are the four types of body membranes and their primary roles?

Mucous membranes line cavities open to exterior (trap pathogens and lubricate); Serous membranes line closed ventral cavities (reduce friction); Cutaneous membrane is skin (protective barrier); Synovial membrane lines joint cavities (produces lubricating fluid).

What are the structural features and protein fiber types of connective tissue?

Connective tissue is the most abundant tissue type, containing cells scattered within an extracellular matrix (ECM) of ground substance and protein fibers. Its fibers include Collagen fibers (strength/resist stretch), Reticular fibers (mesh-like support), and Elastic fibers (stretch and recoil).

What are the five major categories of Connective Tissue Proper and their primary functions or locations?

Areolar tissue (supports inflammation and edema); Adipose tissue (stores energy, insulates, supports metabolic regulation); Reticular tissue (supports immune cells in lymphatic organs); Dense regular tissue (parallel collagen fibers in tendons and ligaments); Dense irregular tissue (irregular collagen fibers in dermis and organ capsules).

How do Cartilage and Bone differ as Supportive Connective Tissue?

Cartilage is flexible, avascular, and heals slowly. Bone is mineralized, highly vascular, and supports calcium storage and blood cell formation.

What are the roles of Blood and Lymph as Fluid Connective Tissue?

Blood transports substances and supports immune defense; Lymph returns fluid to circulation and regulates edema.

What are the four sequential steps of inflammation during tissue injury?

1. Vasodilation (increased blood flow leading to redness and heat), 2. Increased capillary permeability (plasma leakage leading to swelling), 3. Chemical mediators + pressure (stimulate pain receptors), and 4. Immune cell recruitment (clears debris and isolates injury).

What is the difference between regeneration and fibrosis during tissue repair?

Regeneration is replacement with identical functional cells (common in epithelial tissue), whereas fibrosis is the formation of collagen-rich scar tissue that reduces elasticity.

What effects does aging have on tissues?

Slower epithelial turnover, reduced collagen and elastin production, increased fibrosis risk, and thinner skin leading to higher injury risk.

How do Epithelial Tissue and Connective Tissue compare across cellularity, extracellular matrix, vascularity, and regeneration?

Epithelial Tissue has high cellularity (tightly packed), minimal ECM, is avascular, and has high regeneration. Connective Tissue has low cellularity (scattered in ECM), abundant ECM, variable vascularity, and moderate-to-high regeneration.