Comprehensive Anatomy & Physiology Tissue Types and Glands Study Guide

Why is the avascular nature of epithelial tissue important?

Nutrients reach epithelial cells by diffusion from connective tissue, explaining why cuts to the skin don't bleed until deeper tissue is injured.

What is the basement membrane?

A structure that anchors epithelial tissue to connective tissue, providing support, nutrient exchange, and a barrier against invasion.

What is a tissue?

A group of similar cells that work together to perform one or more specialized functions.

What are the four major tissue types?

Epithelial, Connective, Muscle, Nervous.

What are the primary functions of epithelial tissue?

Covers body surfaces, lines cavities and organs, forms glands, protects underlying tissues, absorbs nutrients, filters substances, secretes various substances, and participates in sensation.

Name an example of epithelial tissue.

Skin surface, lining of the digestive tract, lining of blood vessels.

What are the primary functions of connective tissue?

Supports organs, connects tissues, protects organs, stores energy, transports substances, and defends against infection.

What are some examples of connective tissue?

Bone, blood, cartilage, tendons, ligaments, adipose tissue, areolar tissue.

What is the primary function of muscle tissue?

Contracts to create movement.

What are the three types of muscle tissue?

Skeletal muscle, cardiac muscle, smooth muscle.

What are the primary functions of nervous tissue?

Receives and processes information, conducts electrical impulses, controls muscles and glands, maintains homeostasis.

Where is nervous tissue found?

In the brain, spinal cord, and peripheral nerves.

What is polarity in epithelial tissue?

Epithelial cells have two distinct surfaces: the apical surface facing the outside or cavity, and the basal surface attached to the basement membrane.

What is the regenerative capacity of epithelial tissue?

Epithelial cells divide rapidly to replace those lost due to wear and tear.

What are cell junctions in epithelial tissue?

Structures that tightly connect cells, including tight junctions, desmosomes, gap junctions, and hemidesmosomes.

How is epithelial tissue classified?

By the number of cell layers (simple, stratified, pseudostratified, transitional) and the shape of surface cells (squamous, cuboidal, columnar).

What is simple squamous epithelium?

A single layer of flat cells that allows for diffusion, filtration, and gas exchange.

Where is simple squamous epithelium found?

In air sacs of the lungs, blood vessel lining, heart lining, and serous membranes.

What is simple cuboidal epithelium?

A single layer of cube-shaped cells that functions in secretion and absorption.

Where is simple cuboidal epithelium located?

In kidney tubules, thyroid gland, small ducts of glands, and surface of ovaries.

What is simple columnar epithelium?

A single layer of tall cells that may contain goblet cells, microvilli, or cilia, functioning in absorption and secretion.

Where is simple columnar epithelium found?

In the stomach, small intestine, large intestine, uterine tubes, and small bronchi.

What role do goblet cells play in simple columnar epithelium?

Goblet cells produce mucus to protect tissues, lubricate surfaces, and trap pathogens.

What is the function of microvilli in epithelial tissue?

Microvilli increase surface area for absorption, particularly in the small intestine.

What is connective tissue?

The most abundant and widely distributed tissue in the body, characterized by cells spread apart and surrounded by an extracellular matrix (ECM).

What are the major functions of connective tissue?

Supports organs, connects body structures, protects delicate organs, stores energy as fat, transports oxygen, nutrients, and wastes, defends against infection, repairs damaged tissues, cushions organs, and insulates the body from heat loss.

From what embryonic tissue does connective tissue develop?

Mesenchyme.

What are the three major components of connective tissue?

Cells, extracellular matrix (ECM), and fibers.

What is the function of fibroblasts in connective tissue?

They produce collagen, elastic, and reticular fibers and repair damaged tissue.

What role do adipocytes play in connective tissue?

They store triglycerides, cushion organs, insulate the body, and produce hormones involved in metabolism.

What are macrophages and their function?

Large immune cells that destroy bacteria, remove dead cells, clean damaged tissue, and present antigens to immune cells.

What is the role of mast cells in connective tissue?

They are important in inflammation and release histamine and heparin.

What do plasma cells produce?

Antibodies that help destroy invading pathogens.

What distinguishes simple epithelium from stratified epithelium?

Simple epithelium is mainly for absorption, secretion, and diffusion, while stratified epithelium is mainly for protection.

Where is transitional epithelium found?

Only in the urinary tract.

What are the two types of keratinized stratified squamous epithelium?

Keratinized (found in skin) and nonkeratinized (found in mouth, esophagus, vagina).

What is the function of goblet cells?

They produce mucus.

What is the function of microvilli?

They increase absorption.

What is the function of cilia?

They move substances across the cell surface.

What are exocrine glands?

Glands that release products through ducts onto an epithelial surface.

What are examples of exocrine glands?

Sweat glands, sebaceous glands, salivary glands, and mammary glands.

What are endocrine glands?

Ductless glands that release hormones into nearby connective tissue, where they enter the bloodstream.

What are examples of endocrine glands?

Thyroid, pituitary, adrenal glands, and pancreatic islets.

What is merocrine secretion?

A secretion type where the cell releases its product by exocytosis and remains intact.

What is apocrine secretion?

A secretion type where the apical portion of the cell pinches off with the secretion.

What is holocrine secretion?

A secretion type where the entire cell ruptures to release its product, causing the cell to die.

What is the memory trick for secretion types?

Merocrine = Minimal damage, Apocrine = Apex pinches off, Holocrine = Whole cell dies.

What is the significance of connective tissue?

Without it, organs would lack structural support and protection.

What is the clinical correlation of damaged microvilli?

It can reduce nutrient absorption and lead to malnutrition.

What happens to transitional cells as the bladder fills?

They flatten to allow the bladder to expand without tearing.

What is the function of collagen fibers in connective tissue?

They provide strength and support to the tissue.

What is the primary function of white blood cells?

To help destroy invading pathogens and provide immune defense.

What fills the space between cells and fibers in connective tissue?

Ground substance.

What are the main components of ground substance?

Water, proteins, proteoglycans, and glycoproteins.

What is the function of collagen fibers?

Provides tensile strength and is resistant to pulling.

Where can collagen fibers be found?

In tendons, ligaments, dermis, bone, and cartilage.

What deficiency leads to scurvy?

Vitamin C deficiency, which decreases collagen production.

What are the characteristics of elastic fibers?

Thin, stretch easily, and return to original shape.

What function do elastic fibers serve?

Allow tissues to expand and recoil.

Where are elastic fibers commonly found?

In large arteries, lungs, elastic ligaments, and skin.

What is the role of reticular fibers?

Create a supportive framework for delicate organs.

Where can reticular fibers be found?

In the spleen, lymph nodes, bone marrow, and liver.

What are the three major categories of connective tissue?

Connective Tissue Proper, Supporting Connective Tissue, and Fluid Connective Tissue.

What characterizes loose connective tissue?

Contains relatively few fibers and a large amount of ground substance.

What is the function of areolar connective tissue?

Wraps organs, holds tissue fluid, and supports blood vessels.

What is the primary function of adipose tissue?

Energy storage, protection, insulation, and shock absorption.

What type of connective tissue is designed to resist tension?

Dense connective tissue.

What is the difference between dense regular and dense irregular connective tissue?

Dense regular has collagen fibers running in parallel; dense irregular has fibers running in many directions.

What is the primary function of cartilage?

Provides support, reduces friction, and cushions joints.

What type of cartilage is the most common?

Hyaline cartilage.

What are the functions of bone tissue?

Support, protection, mineral storage, blood cell production, and muscle attachment.

What distinguishes fluid connective tissue from other types?

It consists of cells suspended in a liquid extracellular matrix (plasma).

What is the function of blood in the body?

Transport oxygen, remove carbon dioxide, deliver nutrients, and defend against pathogens.

What is the regenerative capacity of bone compared to cartilage?

Bone has a high remodeling and repair ability; cartilage has poor healing due to lack of blood vessels.

What are the cells that build bone called?

Osteoblasts.

What is a clinical correlation of fibrocartilage?

Herniated discs occur when fibrocartilage is damaged.

What memory trick can help remember the function of collagen?

Collagen = Cable (strength).

What memory trick can help remember the function of elastic fibers?

Elastic = Elastic band (stretch).

What memory trick can help remember the function of reticular fibers?

Reticular = Retaining net (support framework).

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