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Chapter 5 & 6 Tissues and Integumentary System Tissues: Cells are arranged in tissues that provide specific functions for the body. Types: there are four main types of tissues: List them. Epithelial, connective, muscular, Nervous epithelial tissue: Where found? Epithelial tissue is widespread throughout the body, covers organs, and lines body surfaces. Characteristics: are made up of tightly packed cells containing little intercellular material, generally lack blood vessels, and are replaced frequently. They tend to have prominent nuclei when viewed under the microscope. Simple – how many layers? 1 Stratified – how many layers? More than 1 layer Functions: They function in protection, secretion, absorption, and excretion Types of Epithelium (epithelial tissues) squamous: What shape are the top cells generally? Flat and scale-like simple: What is this best suited for? Diffusion List several places you are likely to find it. Lungs, blood vessel walls, lymph vessels stratified: What is this best suited for? Protection What does keratinized mean? Contains a substance called keratin Where are you likely to find it? Outer layers of the skin cuboidal: What shape is this cell? Cube-shaped simple cuboidal: This type functions in _secretion_ and _absorption__ in the kidneys and _secretion_in the glands stratified cuboidal: what is the advantage of several layers? Better protection Where is this type found? Mammary glands, sweat glands, salivary glands columnar: What shape is this cell? --elongated What specialized cell is often found with it? Ciliary this cell? Movement of substances across the cell surface What is the function of Simple: Where is it found? Linings of stomach, intestines, uterus In intestinal cells, the surface area is increased with _microvilli_____. What is the purpose of these? Absorption of nutrients Stratified: Where is this type found? Male urethra, parts of the pharynx pseudostratified ciliated columnar: These cells appear layered but really are not. Why do they look layered? Nuclei in varying position within the cells What does “ciliated” mean? Having cilia on the cell surface Where are these cells found? At surfaces facing the lumen of certain passageways Transitional epithelium: Why can’t we classify this type as to shape? The shape changes as tissue distends. Where is it found and why? Urinary bladder – enables it to distend without leaking glandular epithelium: This tissue is made up of cells designed to produce and secrete substances into ducts or into body fluids. Glands that secrete products into ducts are called _exocrine_ glands; those that secrete into body fluids and blood are called __endocrine glands___. . Glands are classified by the ways the glands secrete their products a. _merocrine_ glands release fluid products by exocytosis (pancreas) and are grouped as serous which produce a watery fluid; or mucus, which produce a thicker, protective substance. b. __apocrine__glands lose portions of their cell bodies during secretion (mammary glands). c. ___holocrine___glands release entire cells (oil glands in the skin). Connective Tissue: bind, support, protect, serve as frameworks, fill spaces, store fat, produce blood cells, protect against infection, and repair tissue damage. . Unlike epithelial tissues, connective tissues have abundant matrix, or intercellular material, throughout, and have good blood supplies (except cartilage). composition: collagenous, reticular and elastic fibers. How do they differ? Collagenous is tough and silvery white; Reticular is soft and colorless, elastin is yellowish and has elasticity. cell types: what are the three cell types and their functions? Fibroblasts (produce collagen and other fibers); Macrophages (engulf bacteria and cellular debris); Mast cells (produce heparin and histamine) Types of connective tissues: There are many diverse types of connective tissues. loose fibrous connective (areolar): What are the main functions of this type? Helps hold body parts together The arrangement of the fibers gives it its name, how are they arranged? Cells are widely separated, with fibers loosely packed. What is the main cell type found in this tissue? fibroblasts adipose: is a specialized loose connective tissue designed to store __fat_. Where is it located? (Don’t say “everywhere!) under skin, around joints, within certain abdominal membranes dense fibrous connective: is very strong because of the arrangement of the collagenous fibers. How are they arranged to make this a tough tissue? fibers packed in dense network This tissue is found all over the body. List two common places we can look for it. Tendons and ligaments Cartilage: Cartilage is a rigid connective tissue that provides a supportive framework for various structures. It lacks a vascular system and so heals slowly Cartilage cells are called _chondrocytes___ Cartilaginous structures are enclosed within a connective tissue called _perichondrium_______ Which is the most common type of cartilage? hyaline hyaline: Where is this found? At the ends of bones in joints elastic: is so named because it is ___flexible. Where is it found? _ears vertebrae fibrocartilage: is the toughest of the three. Where is it found? Between bone: What is its matrix composed of? Mineral salts as well as organic matrix materials What are bone cells called? osteocytes This is a “pretty tissue” because of the arrangement of the cells. How are they arranged? In concentric circular arrangements around haversian canals blood: is composed of __blood cells_ and a liquid __plasma___________________. What is its function? Transports materials throughout the body uscle tissue: What is the general function of all muscle tissue? Contraction for m movement cardiac What are three different types of muscle tissue? Skeletal, visceral, Skeletal muscle: Where is it found? In muscles that are attached to bone Its cells are long and so are called muscle _fibers_. They may have several ___nuclei_. The cells appear striped and are said to be __striated__. Is it usually voluntary or involuntary? Usually voluntary Smooth muscle: Where is it found? In walls of hollow visceral organs What is the shape of its cells? Spindle-shaped How many nuclei does it have? One in each cell Is it voluntary or involuntary? Involuntary Cardiac muscle: It is only found in the _heart walls_. Like skeletal muscle it is striped and so is said to be __striated___. The cardiac cells are connected to each other by __intercalated_ _discs____________ Is it voluntary or involuntary? involuntary Nervous Tissue: There are two types of nervous tissue. Where are they found? Brain, spinal cord (central nervous system), and peripheral nerves (peripheral nervous system) neuron: What is its function? Generates and carries nerve impulses neuroglia cells: what are their functions? Support and nourish neurons Epithelial Membranes: These membranes are considered to organs because they are composed of more than one type of tissue. They are composed of a layer of __epithelial_____ tissue and a layer of __connective_ tissue List the four main types of epithelial membranes. Serous, mucous, synovial, integumentary Integumentary System: The __skin____ and its __accessory organs_____ organs make up the integumentary system. The Skin: functions: List the functions of the skin: temperature homeostasis, protection, retards water loss, houses sensory receptors, synthesis of certain chemical substances, excretion structure: The skin consists of an outer ___epidermis___ and an underlying _dermis______________, connected to underlying tissue by the _subcutaneous ___layer (hypodermis) epidermis: The epidermis is made up of stratified _squamous_ epithelium and lacks __blood vessels_. Epidermal layers: bottom to top stratum basale: stratum spinosum stratum granulosum: stratum corneum: and sometimes, the stratum lucidum. In what areas does the skin contain this layer? Palms, soles Which is the living, reproducing layer? Stratum basale Proteins of the epidermis: keratin: What is its function? Helps water retardation, and makes skin impervious melanin: What is its function? Protects against harmful ultraviolet radiation What cell produces it? Melanocyte Skin Color: List the factors that contribute to the color of the skin. Amount of melanin, size of melanin granules, blood vessels in the dermis dermis: The dermis consists of __connective__ tissue with collagen and elastic fibers within a gel-like ground substance. The dermis also contains nerve fibers, sensory fibers, hair follicles, sebaceous glands, and sweat glands. Subcutaneous Layer: What is this layer composed of? Primarily adipose tissue What are the functions of this layer? Insultation, helps attach skin to underlying tissues Accessory structures: hair: Where can hair be found? On skin in most regions of the body Define the term hair follicle? An invagination of the epidermis that extends down into the dermis What is the function of the arrector pili muscle? Pull hair erect when cold or frightened What determines hair color? Melanin and sometimes a reddish pigment called trichosiderin Glands of the integumentary system: sebaceous glands: What type of glands are they? Holocrine glands What structure are they associated with? Hair follicles What is their secretion called? Sebum sudoriferous glands (sweat glands): appocrine are associated with __sexual arousal_ control and secrete __sweat with characteristic odors________ eccrine are associated with ____temperature control___. ceruminous glands are found in the __ear canal__ and secrete ___wax____ nails: Nails consist of stratified __squamous___epithelial cells overlying the nail bed, with the ___lunula_______ as the most actively growing region of the nail root. Temperature regulation: Proper temperature regulation is vital to maintaining metabolic reactions. The ___skin_____plays a major role in temperature regulation with the ___hypothalamus_ controlling it. Active cells, such as those of the heart and skeletal muscle, produce __heat______. Heat may be lost to the surroundings from the skin. The body responds to excessive heat by __dilation__of dermal blood vessels and _sweating______. The body responds to excessive cooling by ___constriction_ dermal blood vessels, inactivating __sweat_____ glands, and increasing muscle usage through __shivering________________. Healing of Wounds and Burns Inflammation, in which blood vessels ____dilate____ and become more _permeable____, causing tissues to become red and swollen, is the body's normal response to injury. . Superficial cuts are filled in by reproducing _epithelial__ cells. . Deeper cuts are closed off by ___clots__, covered by _scabs, and eventually filled in by __fibroblasts_____, making connective tissue. Large wounds leave scars and healing may be accompanied by the formation of __scars_____.