BIO 3342 Lecture Notes - Lecture 37: Epithelium, Thymus, Chondroblast

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Biol Sci 201 Tissue Worksheet Name: Margaret Chang
Objectives
Know the four major tissue types found in the body
Be able to identify all the subcategories of tissues in histological section
Know the cells that are found in each tissue, a location for that tissue, and a function for that
tissue.
Major Tissue Categories
Epithelial: tissue comprised of a sheet of cells that line and cover body surfaces that may be
exposed to the external environment or body cavities that contain internal organs
Connective: tissue that binds other tissues together or supports other structures within the body,
most abundant tissue type in the body
Muscle: tissue that can be excited (cell can be polarized, electrical charge can vary) or contracted
to result in production of body movement
Nervous: tissue characteristics are excitability and conductivity, functions in communication
integration and control
Epithelial Tissue
- Classification criteria of epithelial tissue
o Number of cell layers present
Simple referring to a single layer of cells
Stratified referring to multiple layers of cells
o Shape of the cell
Squamous are flat & scale-like cells
Cuboidal is cubed shape (width and height of cells are roughly equal)
Columnar displays column pattern (height greater than width)
Simple squamous:
- Location : kidneys, lungs, interior lining of blood vessels,
heart, and lymphatic vessels, lining of ventral body cavity
- Function : lines surfaces and cavities, rapid diffusion and
filtration of materials, secretion of lubricating substances
in serous membranes
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Biol Sci 201 Tissue Worksheet Name: Margaret Chang
Simple cuboidal:
- Location : kidney tubules, ducts and secretion areas of
small glands, ovary surfaces
- Function : secretion and absorption of materials and
substances from the lumen
*hollow space (white center) is referred to as the lumen,
epithelial tissue lines the lumen
Simple columnar:
- Location : gastrointestinal tract, lining of uterine
tubes and uterus
- Function : secretion and absorption of materials and
substances (including mucus and enzymes) from the
lumen
*nuclei located at basal end of the cells
Ciliated pseudostratified columnar:
- Location : upper respiratory tract & trachea
- Function : secretion and absorption of
materials and substances (predominately
focuses on secretion of mucus) as well as
propulsion of mucus by ciliary action
*cells touch basement membrane with nuclei centered in the cell, goblet cells present that
secrete mucus onto the apical surface and onto the cilia
Stratified squamous:
- Location : epidermis of the skin (skin exposed to the external environment), linings of
body parts that open to the external environment
(i.e. nose, mouth)
- Function : protects underlying tissues and
structures that may be exposed to abrasions
*cells are basal end may resemble cuboidal
shape, but cells at the apical end display flat
shape, therefore classifying the tissue as stratified squamous epithelium
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Document Summary

Know the four major tissue types found in the body. Be able to identify all the subcategories of tissues in histological section. Know the cells that are found in each tissue, a location for that tissue, and a function for that tissue. Epithelial: tissue comprised of a sheet of cells that line and cover body surfaces that may be exposed to the external environment or body cavities that contain internal organs. Connective: tissue that binds other tissues together or supports other structures within the body, most abundant tissue type in the body. Muscle: tissue that can be excited (cell can be polarized, electrical charge can vary) or contracted to result in production of body movement. Nervous: tissue characteristics are excitability and conductivity, functions in communication integration and control. Location : kidneys, lungs, interior lining of blood vessels, heart, and lymphatic vessels, lining of ventral body cavity.

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