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Flashcards in Module 4: Tissues Deck (49)
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1

4 classifications of tissues

Epithelial
Connective
Nervous
Muscle

2

Epithelial Tissue

AKA epithelium
Covers external surface of the body and lines internal cavities and forms glands
no nerve supply or blood supply

3

Tight junctions/Desmosomes

eip's fit snugly together
very small amount of extracellular material between the narrow spaces of epi's

4

Apical

Free or open surface of the epi
Most have microvilli on their surfaces (for better absorption or secretion)

5

Basal Lamina

non cellular, thin supporting sheet at the bottom of the epic
provides selective barrier

6

Shapes of Epi's

Squamous (thin, flat, nucleus shaped like disk)
Cuboidal (cube like, nucleus shaped like sphere)
Columnar (Tall and narrow, nucleus is long and narrow)

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Layers of Eips

Simple (one layer)
Stratified (2 or more layers)

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Simple squamous

lungs
for diffusion of oxygen and carbon dioxide

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simple cuboidal

kidney tubules
for absorption and secretion

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simple columnar

digestive tract
for absorption of nutrient and secretion of mucus

11

Pseudostratified Columnar

trachea
For secretion of mucus

12

Stratified squamous

epidermis of skin
for protection

13

Stratified cuboidal

swear and mammary glands
for protection

14

stratified columnar

pharynx and male urethra
protection and secretion

15

Transitional Epis

Lining of urinary bladder
stretches in response to tension when urine fills the bladder

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Functions of Epithelial tissues

Protection
Sensory functions (receptors in epis in skin, nose, eyes, ears)
Secretion (glandular epis)
Absorption
Excretion (lining in kidneys filtrates urine)

17

Exocrine Glands

Secret substances onto free surface via ducts
substances include digestive enzymes, mucus, saliva, perspiration, breast milk

18

Endocrine Glands

Ductless, secret their substances directly onto surround tissues and blood
Substances include: hormones from pituitary, thyroid and adrenal glands

19

Connective tissue types (4)

cartilage, ligaments, tendons, bone, blood
has embryonic origin (mesenchyme)
has blood supply (vascular) except cartilage
Has an extracellular matrix

20

Parts of connective tissue

Specialized cells (fibroblast, macrophage, plasma, mast cells)
Extracellular protein fibres (collagen, elastic)
Ground substance (liquid, gel-like or solid form)

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Collagen fibers

flexible and strong
found in bone and cartilage

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Elastic fibers

Made from elastin
not as strong as collagen (but can return to original shape)
found in skin, walls of blood vessels, lung tissue

23

Reticular fibers

Made from collagen (but arranged differently)
thin but organized
found in soft organs such as glands and lymph nodes

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Classification fo connective tissue (5)

loose connective, dense connective, cartilage, bone, blood

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Loose connective tissue

loosely packed fibres
Subcategories: Areolar
Adipose
Reticular

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Areolar

Binds organs together giving strength, elasticity and support
most dispersed, found underneath tips, in cavities, between muscles

27

Adipose

Provides protection, insulation, support and place to store energy
fat tissue found under the skin, around kidneys, within abdomen and kidneys

28

Reticular

Defends the body by filtering out microorganisms and other substances
Network of branching fibres found in spleen, lymph noes, bone marrow

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Dense connective tissue

Densely packed fibers
Subcategories: dense regular
Dense irregular
elastic

30

Dense regular

provides tensile strength and flexibility for anchoring muscles to bones and bones to bones
Found in tendons and ligaments