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Tissues

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by

Heidi Allen

on 12 September 2013

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Transcript of Tissues

Tissues
Tissues
Groups of cells with similar functions
The four types of tissues are:
Epithelial
Connective
Muscle
Nervous

Epthelial Tissue
Connective Tissue
Found throughout the body - most abudant and widely distributed tissue
Muscle Tissue
Muscle tissue contracts to produce movement.
Nervous Tissue
>Neurons receive and conduct electrochemical impulses
>Two functional characteristics are irritability and conductivity
Characteristics
1. Cellularity - Composed almost entirely of cells
2. Special contacts - form continuous sheets
3. Polarity - have apical and basal surfaces
4. Supported by connective tissue
5. Avascular - no direct blood supply
6. Innervated - supplied with nerve fibers
7. Highly regenerative - rapidly replaces lost cells by mitosis
Classification of ET
Simple or Stratified?
Classification of ET
Squamous? Cuboidal? Columnar?
Simple Squamous
Simple Cuboidal
Simple Columnar
Pseudostratified Columnar
Stratified Squamous
Transitional
Glandular ET
1. Endocrine: Ductless glands that produce hormones

2. Exocrine: Glands that secrete their product into a duct and onto a body surface or body cavity.
Characteristics
Common tissue origin
Varying degrees of vascularity
Functions:
Binding and support
Protection
Insulation
Transportation
Nonliving extracellular matrix, consisting of:

>Ground substance - unstructured material that fills the space between cells

>Fibers - collagen, elastic,reticular

>Cells
Connective Proper
Areolar
Connective Tissue Proper
Adipose
Function: Energy and insulation
Location: under the skin, in
the abdomen, and breasts
Location: widely distributed under epithelia
Function: Wraps and cushions organs
Connective Tissue Proper
Reticular
Function:Fibers form the soft internal skeleton which supports most blood cell types.
Location: spleen, lymph nodes, bone marrow
Connective Tissue Proper
Dense Regular
Function: attaches muscle to bone, and bone to bone.
Location: Tendons and ligaments!
Connective Tissue Proper
Dense Irregular
Function: Provides support, strength, and elasticity
Location: Dermis and submucosa of the digestive tract
Hyaline Cartilage
Function:Supports and reinforces, resists compression stress, provides a smooth surface
Location: ends of long bones, costal cartilage
Elastic Cartilage
Function: maintains shape and allows flexibility
Location: Ear, epiglottis
Fibrocartilage
Function: Provides tensile strength and absorbs compressive shock.
Location: Meniscus of knee, intervertebral discs
Osseous Tissue
Function: Supports and protects, provides levers for movement
Location: Bones!
Blood
Function: transport medium, protection
Location: Blood vessels
Skeletal Muscle
>Voluntary
>Contract to pull on bones or skin
>Long, cylindrical, multinucleate, striated
Cardiac Muscle
>Found only in the heart
>Involuntary
>Striated, uninucleated, branched
Smooth Muscle
>Involuntary
>Spindle-shaped
>No striations
Full transcript