BIOL 2010 Lecture Notes - Lecture 2: Loose Connective Tissue, Epithelium, Histology

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Published on 2 Feb 2017
School
TNTECH
Department
Biology
Course
BIOL 2010
Professor
LAB TWO
Histology: study of tissues
FOR QUIZ:
5 pics-where and how to identify
Tissues: a bunch of similar cells that come together
Epithelial: (Tables 5.2, 5.3)
o Sheets of cells
o Functions: protection, absorption, filtration, excretion, secretion, and sensory
reception (depending on the location in the body)
o 2 Types
covering/lining epithelium (covers and lines the inside and outside of
body)
glandular epithelium (forms glands)
o Classified off two things: number of cell layers and shape of cells
Classes
Simple
Pseudostratified Columnar
Stratified
Shapes
Squamous
Cuboidal
Columnar
Simple (single layer) squamous
Kidney glomeruli
Alveoli in lungs
Lining heart and blood vessels
Line ventral body cavity
WHY?? Because of its thin structure, this tissue is great for oxygen
exchange
Stratified (multiple layers) squamous
Mouth (eating something hard/sharp, multiple layers protect the
mouth from cuts and bleeding when scraped)
Esophagus
Skin
WHY?? Because there are so many layers, it is great for areas that
get a lot of abrasion
Cuboidal (simple and stratified)
Renal tubes (kidney)
Ducts and secretory portions of many glands
Surface of ovaries
Ducts of sweat, mammary, and salivary glands
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WHY?? This tissue is great for secretions, absorptions, and
transportation since they are sturdy and offer protection to the
tissues
Columnar (simple, stratified, and pseudostratified)
Lines digestive tract
Lines excretory ducts
WHY?? This tissue is important in absorption and movement of
mucous
Pseudostratified epithelium rarely in squamous or cuboidal
(because cells have different heights, it appears stratified is only
one layer)
Connective Tissue
o Found all throughout the body and is the most abundant and widely distributed
of the four major tissue types
o Functions:
binding and support of body parts
protection
insulation
energy storage
transportation of substances within the body
o derived from mesenchymal cells in the embryo
o Highly vascular (having a rich supply of blood from blood cells) with the
exception of cartilage (which is avascular) and dense connective tissue (which
is poorly vascularized)
Cartilage takes a long time to heal because it is avascular
o Only major tissue type made primarily of non-living material called an
extracellular matrix
o Fibrous connective tissue with many conspicuous fivers
o Loose connective tissue (know table 5.4)
Areolar: loosely binds adjacent structures and surrounds blood vessels,
nerves, and muscles
Attaches to epithelial tissue to underlying tissues
Made of collagen, elastic, and reticular fibers
Reticular: full of reticular (network) fibers
Found in:
o Kidneys
o Spleen
o Lymph nodes
o Bone marrow
Function: to form a soft skeleton to support the organs it is
around
o Dense connective tissue: large, robust fibers, strong (Table 5.5)
Regular: parallel collagen fibers, tendons, and ligaments
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Document Summary

Tissues: a bunch of similar cells that come together. Epithelial: (tables 5. 2, 5. 3: sheets of cells, functions: protection, absorption, filtration, excretion, secretion, and sensory reception (depending on the location in the body, 2 types. Covering/lining epithelium (covers and lines the inside and outside of body) Glandular epithelium (forms glands: classified off two things: number of cell layers and shape of cells. Because of its thin structure, this tissue is great for oxygen exchange. Mouth (eating something hard/sharp, multiple layers protect the mouth from cuts and bleeding when scraped) Because there are so many layers, it is great for areas that get a lot of abrasion. Ducts and secretory portions of many glands. Ducts of sweat, mammary, and salivary glands. This tissue is great for secretions, absorptions, and transportation since they are sturdy and offer protection to the tissues. This tissue is important in absorption and movement of mucous.