3.1 Histology Knowt Cards Bryce LaRoche

What is Histology?

The study of tissues

What is cell differentialism?

When embryonic cells begin to synthesize different types of proteins.

What are the four types of tissues in the body

Connective tissues, epithelial tissues, muscle tissues, nerve tissues.

What are three characteristics of epithelial tissue?

They stick together, have no blood vessels, and are often found on a surface or lining of the body.

What does Avascular mean?

Without blood vessels

What are three ways epithelial tissues are classified.

The layering of the cells, the shape of the cells, and the cellular modifications of the cells.

What are simple cells?

Cells arranged in one layer.

What are stratified layers?

Cells in multiple layers.

How do squamous cells look?

Flat

How do cuboidal cells look?

Boxy

How do Columnar cells look?

Tall and skinny

What are three types of cellular modifications?

Cilia, microvilli, and goblet cells.

What type of cells do you find cellular modifications on?

They are usually found on Columnar epithelial cells.

What are cilia?

Fine motile hairs

What are microvilli?

Finger-like extrusions that increase the surface area of the cell for better absorption.

What are goblet cells?

Mucus secreting Columnar cells.

Where do you find simple squamous epithelial cells?

The alveoli of the lungs, lining of all blood vessels, the walls of the capillaries called the endothelium, and the various membranes of the body.

Where do you find simple cuboidal cells?

The urinary tubules of the kidney, liver, pancreas, thyroid, and other glands of the body.

What does Aden/o mean?

gland

Where do you find simple columnar ciliated Epithelial cells?

In the lining of women’s fallopian tubes.

What do the cilia on the fallopian tubes do?

Push eggs from the ovaries to the uterus

Where do you find simple columnar Epithelium with goblet cells?

The lining of the stomach.

What do the goblet cells in the stomach do?

Neutralize the stomach acid with mucus.

Where do you find simple columnar brush-border Epithelium with goblet cells?

The lining of the intestine

Where do you find pseudo stratified columnar ciliated Epithelium with goblet cells?

The lining of the respiratory tract.

What does pseudo mean?

false

What does pseudo stratified mean

False stratified due to the columnar cells not being all at the same height

What does the cilia in the respiratory tract do?

They trap dust

Where do you find transitional Epithelium?

The lining of the urinary bladder

Why is it called transitional epithelium?

The tissue becomes stretched and changes as the bladder fills with urine

What does lumen mean?

The cavity of a tubular organ

What are the two subtypes of stratified squamous Epithelium?

Non-keratinizing and keratinizing

What is keratin?

A hardening protein.

Where do you find keratin?

Hair, nails, skin

What are non-keratinizing stratified squamous epithelium?

Epithelial tissue made of layered and flat cells that don’t use keratin to produce layers of dead cells.

Where do you find non-keratinizing stratified squamous epithelium?

The lining of the oral cavity, anal canal, and vaginal canal

What is keratinizing stratified squamous epithelium?

Epithelial tissue made of layered and flat cells that produces layers of dead cells with keratin.

Where do you find keratinizing stratified squamous epithelium?

The epidermis of the skin.

What do all cells need to be surrounded by?

All cells need to be surrounded by a liquid.