unit 2 histology

histology

Tissues

A group of cells that perform the same function

Tissues compose

organs

organs are typically made of ________ tissues

multiple

histology is

the study of tissues

Epithelial tissue functions

covering, lining, secreting

examples of epithelial tissue

outer layer of skin, intestines, respiratory tract

connective tissue function

binding and support

connective tissue example

adipose tissue, cartilage, bone, blood

functions for muscle tissue

functions for contraction for movement

example for muscle tissue

skeletal muscle

functions of the nervous tissue

transmit signals

example of nervous tissue

brain, spinal cord, nerves

what is this tissue?

Epithelial tissue

What is this tissue?

Muscle tissue

what is this tissue

connective tissue

What is this tissue?

Nervous Tissue

Ehlers-Danlos Syndrome is a

Mutation affecting the synthesis of connective tissue

Ehlers-Danlos Syndrome Symptoms

Hyper mobility, loose unstable joints that dislocate easily, extreme fatigue, skin that easily bruises, digestive problems

Epithelial tissues Greek roots meaning (EPi)(Thele)

Above, nipple

functions

to cover, line, and form secretions

skin,scalp,intestine epithelial cells are frequently replaced how often?

skin-30 days, scalp-3 days, intestines, 6 hours

do epithelial tissues have blood vessels? how do they acquire nutrients?

No blood vessels, rely on diffusion to acquire nutrients

Epithelial tissue layers

single layer

simple

multiple layers

stratified

appears stratified, but is 1 layer

pseudostratified

Flat, scale like

Squamous

What is this

Simple Squamous

what is this

stratified squamous

cuboidal

cube shaped

what is this

simple cuboidal

what is this

stratified cuboidal

columnar

rectangular

what is this

simple columnar

what is this

pseudostratified columnar

Squamous epithelial cells function

regulate the passage of substances into other tissues, can be a protective barrier against microorganisims

Location in Body

-blood vessels, vody cavities, outer layer of skin

Cuboidal Epithelial Cells Function

Aide in secretion, excretion, and absorption

Located in the collecting ducts of

Kidney,pancreas, salivary glands, sweat glands

Columnar epithelial cells function

secretion and absoprtion

Many have small hairlike projections called

cillia

Increase _______________ of organs

surface area

Location in the body

stomach, pharynx, respiratory tract

connective tissue

the main functions of connective tissues are to bind and support structures in the body

connective tissues are composed primarily of two types of fibers

Collagenous fibers, elastic fibers

Collagenous Fibers

Long thick fibers made of protein collagen (Very rigid and has high tensile strength)

Elastic Fibers

composed of protein elastic, very flexible, found in body where flexibility is required

what is this

collagen

what is this

elastin

both collagen and elastin are broken down by

sunlight (UV/X rays PNETRARATE skin) Nicotine (Tabacco smoke)

Why anti aging marketing is fake

Collagen is a protein, not lipid soluble, skin can’t absorb it through a cream. Or- a supplement, because your stomach acid would denature the proteins.

Loose vs Dense Connective tissue

Loose connective Tissue

Mixture of collagen and elastic fibers, tissue helps attach organ or tissue to another

examples of loose connective tissue

blood, adipose

What is this

Loose connective tissue

What is this

dense connective tissue

It is mostly__________________ fibers

collagenous

Connects_______ to ______ and is very strong

muscle, bone

examples

tendons, ligaments

WHat is this

Hyaline Cartilage

hyaline cartialage is the ________ common

most

it is composed of more______ than____, making it

collagen, elastin, flexible but firm

examples

nose, bone coverings

What is this

Elastic Cartilage

Contain primarily

elastin

Very

flexible

examples

ears, vocal cords

What is this

Fibrocartilage

It contains almost pure

collagen

It is very

tough

Used for _______ and __________ ___________________

padding, shock, absoprtion

examples

knees, vertebral discs\

what is this

adipose tissue- known asfat cells

it does what

store lipids in droplets that accumulate indefinitely

what is this

bone

Most______ connective tissue

rigid

Contains primarily collagenous fibers hardened by

minerals

what is this

blood

connective tissue that is not composed of

fibers

helps maintain _________ in the body

connections

what is this

hyaline cartilage

what is this

elastic cartilage

what is this

fibrocartilage

what is this

adipose

what is this

bone

what is this

blood