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24 Cards in this Set

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Define Tissue
Groups of cells that are similar and perform a related function
Define gland
Tissue that secretes a biological product.
Types of Tissues
Epithelial
Muscle
Nervous
Connective
Define Epithelial Tissue
Sheet of cells that cover body surfaces or cavities
What does Epithelial Tissue Work as?

Functions?
Interface Tissue

Apsorbtion, secretion, excretion, filtration, protection
Special Characteristics of Epithelial Tissues
Cellularity, Polarity, Rapid Division, Innervated, Avascular, Specialized contacts, supported by connective tissue
What are 2 surfaces of Epithelial Tissue?
Apical - surface (part you can see)
Basal - bottom (part you can't see)
- Acts as selective filter
- Basement membrane
Basement Membrane
Anchors cell
Epithelial Nomenclature
2 Prefixes - Stand for layers
Simple - 1 layer
Stratified - 2 or more
3 suffixes - Stand for shape
Squamous - flat
Cuboital - cubed
Columnar - columned
Simple Squamous Tissue
Description
Function
Location
D - single layer flattened cells, close
fitting
- sparse
- relatively permeable
F - filtration
L - areas of rapid diffusion (kidneys,
lungs)
Special Apical Structures
Microvilli
- tiny hairs
- aid in apsorbtion
Cilia
- tiny hairs
- move things into and out of cell
Specialized Simple Squamous
Nickname
Description
Function
Location
N - Endothelium
D - Top layer smooth & non thrombogenic
F - Denuding of layer exposes collagen
& thrombogenic receptors
L - Lines lymph, blood vessels, heart, &
cornea
Simple Cuboital Endothelium
Description
Function
Location
D - single layer of cubed shaped cells
- large spherical nucleus
F - Secretion & Absorption
L - Excretoil glands
kidney tubules
ducts
secretory portions of small glands
Simple Columnar
Description
Function
Location
D - Tall column shaped cells
- Round nucleus
- 2 distinct features
- contain goblet cells that secrete mucus which lubricates & protects
- dense apical microvilli
F - greater absorption & mucus secretion
L - nonciliated (dig tract)
- ciliated (bronchi, uterine tubes)
Pseudostratified Columnar
Description
Location
Function
D - sinlge layer of cells
F - secretion of mucus
L - sperm / trachea
Stratified Epethelial Tissue
Description
Primary Role
2 or more layers of cells
Basal cells - regenerate from below &
push their way to the surface
Increased durability
Primary Role / Function: Protection
Stratified Squamous
Description
Function
Location
Other
D - multiple layers
- stratified tissue on top
- cuboital tissue on bottom
- thick membrane
F - protects skin from abrasion
L - outer layer of skin
Receives nutrients from connective tissues
Stratified Cuboital
Description
Location
rare in body
two cell layers thick
mammary glands/ sweat glands
Transitional Epithelial Tissue
Description
Location
Function
several layers
basal - cuboital
apical - domed
resembles stratified squamous & cuboital
stretches readily / permits distention
lines urinary bladder, ureters
Glandular Epithelium
D
Secretion components
Modes of Secrtion
D - Classified as endocrine / exocrine
- secretion is usually aqueous
(proteins, lipids, steriods)
- Contains ducts
- can be multi or unicellular
MOS - Merocrine
- Hellocrine
Endocrine Glands
Release?
How?
relelase hormones
through exocytosis directly into extracellular space which then enters the blood or lympth so that it is transported to target organs
Hormones
3 Types & Examples
Peptides : Insulin
Steroids - Estrogen
GLycoproteins - HcG
Connective Tissue
Description
D - most abundant & widely distributed tissue type
- amount in particular region varies
Connective Tissue
Common Characteristics
-Common Origin - orig. from embryonic mesenchyme (dev. tissue)
-During dev. 3 primary layers dev. (ie. mesoderm mesenchyme)
-Composed of star shaped mesenchyme cell
-Varying degrees of vascularity
-Cartilage (only avasc. conn tissue)
-Adipose (richly vascular)
-Contains extracellular matrix (surrounds & bathes cell)