Chapter 3 - Tissues and Early Embryology (Exam I)
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List the 4 general tissue types
Epithelial
Connective
Muscle
Nervous
___ is the study of tissues
histology
An epithelium is a ____ of cells that covers exposed surfaces and lines internal cavities and passageways
sheet
Is the epithelial an avascular or vascular sheet of cells? does it have a lot of nerves?
avascular
yes
How does the epithelium stay alive?
overlying and underlying connective tissue
What are the functions of epithelial tissue
provide physical protection
control permeability
provide sensation
provide secretions, not excretions
What are the 3 specializations of epithelial cells (apical features)
microvilli
sterococilia
ciliated epithelium
Function of microvilli
increased SA of epithelium
Function of ciliated epithelium
cilia on apical surface beat together to move mucous/pathogens
What is stercocilia
long microvilli that don't move (found in male reproductive parts and inner ear)
how does the epithelium maintain it's integrity
intercellular connections give it strength/stability
attachment to the basal lamina (between epithelium and underlying connective tissue)
epithelial maintenance and renewal is self-perpetuated
What are the classifications of epithelia
Layers: simple or stratified
Shapes: squamous, cuboid, transitional, columnar
what part of a stratified epithelium do you look at to classify its shape
surface
which epithelial shape has circular nucleli
cuboid
which epithelial shape looks like a fried egg
squamous
which epithelial shape is rare
cuboid
which epithelial shape has egg-shaped nuceli and has a distinct north and south pole
columnar
where is pseudostratified ciliated columnar epithelium found typically?
trachea
(nasal cavity, bronchi, male reproductive tract)
what are the 3 different types of exocrine glands
serous
mucous
mixed exocrine
____ glands secrete watery fluids rich in enzymes
serous
____ glands secrete glycoproteins called mucins that absorb water to form mucus
mucous
____ glands contain cells capable of bot serous and mucous secretions, and therefore secrete both
mixed exocrine
___ mechanism of glandular secretions works by creating secretory vesicles, packaging them, and releasing them via exocytosis; which gland is an example of this
merocrine
salivary
___ mechanism of glandular secretions works by shedding the apical portion of the cell; what is an example of this
apocrine
mammary
____ mechanism of glandular secretions works by packing the cell full of secretory products until it bursts open; what is an example of this
Holocrine
sebaceous
are connective tissues open to the environment?
NEVER
What are the 3 main components of all connective tissue
special cells
extracellular protein fibers
ground substance
The matrix is a collective term for the extracellular component of any connective tissue that's made up of the ___ ____ and the ____ ____
protein fibers
ground substance
The matrix can be full of ____ or be relatively _____
fibers; open
what are the 3 main types of connective tissue
connective tissue proper
fluid connective tissue
supporting connective tissue
____ are stationary and involved with local maintenance, repair, and energy storage; these include fibrocytes, fibroblasts, fixed macrophages, adipocytes, mesenchymal cells, and melanocytes
fixed cells
____ produce connective tissue fibers
fibroblasts
___ maintain connective tissue fibers and matrix
fibrocytes
_____ store lipid reserves
adipocytes
____ synthesize melanin
melanocytes
_____ help defend and repair damaged tissues; include free macrophages, mast cells, lymphocytes, neutrophils, and cosinophils
wandering cells
____ are mobile/traveling phagocytic cells (derived from monocytes of the blood)
free macrophages
____ stimulate local inflammation via release of histamine and heparin
mast cells
____ participate in immune response by developing into plasma cells that produce abx
lymphocytes
____ and ____ and small, phagocytic blood cells that mobilize during infection of tissue injury
neutrophils and cosinophils
What are the 2 types of connective tissue proper
loose and dense
What are the2 types of fluid connective tissue
blood and lymph
What are the 2 types of supporting connective tissue
cartilage and bone
Which fibers make up the connective tissue proper
collagen, reticular, elastic
_____ are very long, cylindrical fibers made up of 3 subunits (reticular fibers) coiled around one another
collagen fiber
_____ the most common and strongest fiber
collagen
_____ and ____ BOTH have collagen proteins
collagen fibers
reticular fibers
____ fibers are a single unit of collage proteins
reticular
____ fibers contain the protein elastin
elastic
reticular fiber = ____ collagen fiber(s)
___ reticular fiber(s) = collagen fiber
1
3
What are the 3 types of LOOSE connective tissue
areolar
adipose
reticular
LACT or loose areolar connective tissue, is made up of what 3 materials
collagen fibers
elastic fibers
fibrocytes
LACT ___organs, provides ____ but permits independent movement; ____ cells provide defense against pathogens
cushions
support
phagocytic
adipose tissue provides ____ and ___ shocks; ____ (reduces heat loss); and ___ energy
padding and cushions
insulates
stores
what are the 2 types of dense connective tissue propers
Regular (DRCT)
Irregular (DICT)
3 locations of DRCT (and their descriptions)
tendons (connect skeletal muscle to bone/cartilage)
aponeuroses (sheets/ribbons that cover muscle surface and help attach muscle to other things)
ligaments (connective cartilage to cartilage, bone to cartilage, or bone to bone)
3 locations of DICT
DEEP dermis
periosteum and perichondrium (cover bone and cartilage)
capsules of organs
what are the fibers in DRCT
collagen, elastic, reticular
Function of DRCT: provides firm ____
conducts ____ of muscles
reduces ____ between muscles
____ relative positions of bones
attachment
pull
friction
stabilizies
Function of DICT:
provides ____ to resist forces applied from ___ direction (s)
helps prevent ____ of organs such as the urinary bladder
strength; many
overexpansion
Blood is a fluid connective tissue containing a matrix called ____ and various types of cells, or formed elements. What are examples of these formed elements
plasma
RBC, WBC, platelets
The lymph empties into the ____
venous system
____ if water and small solutes filtered out of capillaries to bath body's cells
interstitial fluid
___ contain few cells, high amounts of fiber, and a ground substance that may contain insoluble calcium salts
supporting connective tissues
what are the 3 types of cartilage; which is the most common
hyaline (most common)
elastic
fibrous
____ are little lakes where cells live; are they present in all types of cartilage and bone?
lacunae
yes
hyaline cartilage provides ___ but somewhat ____ support; reduces ___ between bony surfaces
stiff; flexible; friction
which cartilage is the most flexible
elastic cartilage
elastic cartilage provides ____, but tolerates _____ without damage and ____ to original shape
support
distortion
returns
fibrous cartilage ____ compression
____ bone-to-bone contact
____ relative movement
Where is it located?
resists
prevents
limits
intervertebral discs, knee joint, between pubic bones of pelvis
as we age, we lose ____% of water in intervertebral discs, which ____ up the fibers, causing older people to become _____
25
tears
shorter
what are the two types of bone
compact; have osteons
spongy (cancellous); have trabeculae
____ are little canals/spaces that connect osteocytes to each other
canaliculi
___ are the rings of osteons
lamelle
what are the 4 types of membranes
mucous
serous
cutaneous
synovial
____ are wet membranes with a connection to the exterior; act as barrier that resists entry or pathogens
mucous
_____ are membranes that line the ventral body cavity
serous membranes
___ is a thick, dry, water-resistant membrane
cutaneous
_____ are membranes that consist of LACT with an incomplete layer of overlying epithelium
synovial
_____ fascia is continuous
deep
fatty tissue aka ____; below to which type of fascia?
camper's fascia or subcutaneous layer
superficial
what are the 3 types of muscle tissue
skeletal
cardiac
smooth
____ cells are long, cylindrical, striated and multinucleate
Located at ____ of digestive , respiratory, urinary tracts
generates ____
_____ internal organs
skeletal muscle
entrances/exits
heat
protects
_____ cells are short, branched, and striated; usually with a single nucleus; cells are interconnected by intercalated discs
located at ____
____blood, maintains _____
cardiac muscle
heart
circulates; blood pressure
____ cells are short, spindle-shaped, and nonstriated with a single, central nucleus
located at ____ of blood vessels and in ____, ___, ___, ___ organs
____ food, urine, and reproductive tract secretions
controls ____ of respiratory passageways
regulates ___ of blood vessels
smooth muscle
walls; digestive, respiratory, urinary, reproductive
diameter
diameter
are there nerves in the brain or spinal cord?
no
What are the two types of neural tissue cells; what are neural tissues known as
neurons and neuroglia
neural or nervous tissue
____ are the cells that transmit the electrical signals
____ are the supporting cells of the neural tissue
neurons
neuroglia
neurons don't have ____ because they rarely replicate; and do so with great difficulty
centrioles
What is the difference between endocrine and exocrine glands
exocrine glands secrete their products onto body surfaces or cavities and contain ducts
endocrine glands are DUCTLESS and secret product directly into the bloodstream
what are goblet cells
unicellular/individual secretory cells that occur in epithelia containing scattered gland cells