Tissue part 1

differentiation

Process in which unspecialized cells become specialized cells.

stem cell

Undifferentiated cell that can develop into many different cell types.

ectoderm

Outer embryonic layer that develops into the epidermis and nervous system.

mesoderm

Middle embryonic layer that develops into muscles and connective tissues.

endoderm

Inner embryonic layer that develops into the lining of organs and glands.

epithelial tissue

Tightly packed tissue that covers surfaces, lines cavities, and forms glands.

tight junction

Connection between epithelial cells that prevents substances from leaking between cells.

squamous cells

Flat, thin epithelial cells specialized for diffusion and filtration.

cuboidal cells

Cube-shaped epithelial cells specialized for secretion and absorption.

columnar cells

Tall epithelial cells specialized for absorption and mucus secretion.

simple epithelium

Epithelium made of a single cell layer.

stratified epithelium

Epithelium made of multiple layers for protection.

exocrine gland

Gland that releases substances into ducts.

endocrine gland

Ductless gland that releases hormones directly into the bloodstream.

goblet cell

Modified columnar cell that secretes mucus.

mucus

Slippery protective secretion that lubricates and traps particles.

connective tissue

Tissue that supports, binds, protects, and connects body structures.

extracellular matrix

Material surrounding connective tissue cells made of fibers and fluid.

collagen fibers

Strong, flexible fibers that resist stretching.

elastic fibers

Fibers capable of stretching and recoiling.

reticular fibers

Thin fibers forming supportive networks in organs.

areolar tissue

Loose connective tissue that supports and connects surrounding structures.

adipose tissue

Fat-storing connective tissue that cushions and insulates the body.