Tissue level of organization

what are tissue(s)

These are groups of cells which have a common place within embryo development and that function together to carry out activites

What is the disepline of histology

This the study of tissues

What is a Pathologist

This is a physician who looks at cells and tissues to help others make diagnoses

What are the four types of tissues in the body

Epithelial

Connective

Muscular

Nervous

Define Epithelial tissue(s)

This are tissues which cover body surfaces, lines hollow organs, cavities, ducts, and forms glands. They allow for the external and internal world of the body to interact.

Define connective tissue(s)

These are tissues which function to protect and support the body’s organs, store energy, provide immunity to the body

Define Muscular tissue(s)

These are tissues which give the body the ability to contract and generate force which results in those abilities buy in heat production

Define Nervous tissue(s)

These are tissues that detect changes in variety of conditions both inside and out that make electrical signals to active muscular contractions or glandular secretions in response.

What is a Biopsy

This is the examination of living tissue which has been removed to help in diagnose of disorders and detections of issues of the tissues/cells

what are the 5 main types of junctions between cells?

Tight

Gap

Adhere

Desmosome

Hemidesmosome

what are cellular junctions

These are contact points between cells plasma membrane

define tight junctions

These are junctions which make a weblike network of fused proteins between adjecce cells that function to block off passageways between cells

examples include: Epithelial tissue of the stomach, intestines and urinary tract

Define Adhere junctions

these are junctions which contain plaques of proteins which attach to both side of the membrane through mircofilaments and join cells together by glycoproteins called “cadherins”. they help for extensive contractile actitvies

• The Cadherins attach to the other cadherins which join the cells together

• they also make extensive zones called adhesion belts since they tend to encircle the cells

Define Desmosomes

Very similar to adhere however instead of attaching to the microfilaments they attach to intermediate filaments

• these tend to be common in the epidermis and the cardiac muscle cells since they help with perventing cells from separating under tension

define Hemidesmsomes

Again very similar to Desmosomes and Adherens but the difference lies in the the type of glycoproteins they use being “intergins”, the function which is to anchor the cell to the basement membrane, and that is it only one instead of like desmosomes being two

Define gap junctions

these are junctions which are made up of membrane proteins called connexions which make a fluid filled tunnels which allows for ions and small molecules to pass through and exchange cytosplasma between cells

which type of junctions presents the contents of organs from leaking into surroundings tissues

Tight junctions

which types of cell junctions are found epithelial tissue

tight junctions

Gap junctions

Adherens

Desmosomes

Hemidesmsomes

what are the differences between epithelial tissue and connective tissue

1) the number of cells and the amount of ECF is between the cells

• Epithelial tissue: they are tightly packed and don’t have a lot of a extracellular fluid

• Connective tissue: they have lot of extracellular fluid and they spaced out

2) present blood vessels

• Epithelial tissue: they don’t have blood vessels

• Connective tissue: they contain a lot of blood vessels

3) Layers

• Epithelial tissue: they are almost always the top layer

• Connective tissue: they tend to be supporting layers and not top layers

Why are epithelia and connective tissue found adjacent to each other?

Because epithelial tissue lacks blood vessels and forms sur-

faces, it is always found immediately adjacent to blood vessel–rich

connective tissue, which enables it to make the exchanges with

blood necessary for the delivery of oxygen and nutrients and the

removal of wastes that are critical processes for its survival and

function.