A&P I Lecture 5: Tissue Types, Structure, and Function

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What is the chemical level of biological organization?: Atoms combine to form molecules.
What forms cells in the cellular level of biological organization?: Molecules form cells that regulate functions.
What is the tissue level of biological organization?: Cells and extracellular materials form tissues.
What do tissues come together to form at the organ level?: Organs.
What is the system level of biological organization?: Organs work together to form body systems.
Name the four primary tissue types.: Epithelial, Connective, Muscle, Neural.
What are the main functions of epithelial tissue?: Protection, secretion, absorption.
What is the primary role of connective tissue?: Fills spaces, supports tissue, stores energy.
What is the function of muscle tissue?: Contracts to produce movement.
What does neural tissue do?: Conducts electrical impulses and processes information.
What are the structural features of epithelial tissue?: Apical surface, base, and basement membrane.
What are the shapes of epithelial cells?: Squamous, Cuboidal, Columnar.
What types of epithelial tissue layers exist?: Simple (single layer) and Stratified (multiple layers).
What is the function of simple squamous epithelium?: Absorption, diffusion, reduces friction.
Where is simple squamous epithelium found?: Alveoli, kidney tubules, endothelium, mesothelium.
What characterizes stratified squamous epithelium?: Multiple layers that protect from abrasion.
Where is stratified squamous epithelium located?: Skin, mouth, esophagus, anus, vagina.
What is the function of cuboidal epithelium?: Secretion and absorption.
Where can cuboidal epithelium be found?: Glands, ducts, thyroid, kidney tubules.
What is transitional epithelium and where is it found?: Stratified with variable shape; found in bladder, ureters, parts of urethra.
What are the characteristics of columnar epithelium?: Tall, rectangular cells; involved in secretion and absorption.
What are the types of intercellular connections in epithelial tissue?: Tight junctions, adhesion belts, gap junctions, desmosomes.
What do occluding junctions (tight junctions) do?: Prevent diffusion between adjacent epithelial cells.
What is the role of adhesion belts in epithelial tissue?: Reinforce tight junctions and provide structural integrity.
What is the function of gap junctions?: Permit passage of ions and small molecules between cells.
What are desmosomes and where are they found?: Strongest cell junctions for mechanical stability; found in skin and heart.
What are the two types of glands derived from epithelial tissue?: Endocrine and Exocrine.
What is the difference between endocrine and exocrine glands?: Endocrine glands secrete hormones into the bloodstream; exocrine glands secrete onto surfaces or ducts.
What is the function of goblet cells?: Secrete mucin, which combines with water to form mucus.
What are the general functions of connective tissue?: Fills internal spaces, provides support, stores energy.
How does connective tissue differ from epithelial tissue in terms of vascularity?: Connective tissue is highly vascular and sensory, containing many blood vessels, unlike epithelial tissue which has no direct blood supply.
What are the main components of connective tissue?: Specialized cells, fibers, and ground substance (matrix).
What is areolar connective tissue?: A type of loose connective tissue that acts as packing tissue and contains all cell types.
What are the components of areolar connective tissue?: Arteries, veins, blood vessels, collagen fibers, elastic fibers, macrophages, fibroblasts, mast cells, and adipocytes.
What is the primary function of adipose tissue?: Energy storage and insulation.
What is reticular connective tissue and where is it found?: A type of loose connective tissue that provides a supportive framework in the liver, spleen, and lymph nodes.
What characterizes dense regular connective tissue?: It has parallel collagen fibers and fibroblasts, primarily found in tendons and ligaments.
What is the structure of dense irregular connective tissue?: It has interwoven collagen fibers with no specific pattern, providing structural support, found in the dermis.
Where is elastic connective tissue located and what is its function?: Located in vertebral ligaments and large vessels, it provides stretch and flexibility.
What are the main components of blood as a fluid connective tissue?: Plasma (matrix), red blood cells (RBCs), white blood cells (WBCs), and platelets.
What is the primary function of red blood cells?: To transport oxygen and carbon dioxide.
What is the role of white blood cells?: Defense against pathogens.
What is cartilage and what are its main characteristics?: A type of connective tissue with a matrix containing chondroitin sulfate, composed of chondrocytes in lacunae, and has no blood vessels.
What are the three types of cartilage?: Hyaline, elastic, and fibrous cartilage.
What is the difference between appositional and interstitial cartilage growth?: Appositional growth adds to the surface via chondroblasts, while interstitial growth expands from within via dividing chondrocytes.
What is the structure of bone tissue?: Bone matrix consists of 2/3 calcium salts and 1/3 collagen fibers, making it strong, rigid, yet slightly flexible.
What are lacunae in bone tissue?: Small cavities that house osteocytes.
What is the function of the periosteum?: It covers the bone and consists of fibrous and cellular layers.
What are the two types of body membranes?: Mucous membranes and serous membranes.
What is the function of synovial membranes?: They line joint cavities and produce synovial fluid.
What are the three types of muscle tissue?: Skeletal, cardiac, and smooth muscle tissue.
What characterizes skeletal muscle tissue?: It is voluntary, striated, and multinucleated.
What is the function of cardiac muscle tissue?: It is involuntary and pumps blood through the heart.
What is the primary role of smooth muscle tissue?: Involuntary movement found in the walls of blood vessels and organs.
What are the two main types of nervous tissue?: Neurons and neuroglia (glial cells).
What is the function of neuroglia?: They support the framework of nervous tissue, maintain the extracellular environment, and repair neural tissue.