2-Connective Tissue Flashcards
All connective tissue can trace back to _______
Mesoderm (mesenchyme cells)
What are the 2 major divisions of connective tissue?
Connective tissue proper
Specialized connective tissue
What is the primary function of connective tissue?
Provides and maintains form of the body
What is connective tissue made of?
- Ground substance
- Fibers
- Cells
Glycosaminoglycans and structural glycoproteins make up which component of connective tissue?
Ground Substance
What is the main function of ground substance?
Lubricant and barrier
Where do you usually see ground substance?
Around the heart, lungs, and GI tract
Ground Substance is primarily __________
Sugar
Where is dermatan sulfate found?
In the dermis of the skin
What type of collagen is dermis made of?
Type 1
Chondroitin Sulfate is made up what type of collagen?
Type 2
Chondroitin Sulfate can be found where?
In the cartilage of joints
Heparan Sulfate is what type of fiber
Type 3 collagen
Heparan Sulfate can be found where?
In reticular fibers
What are structural glycoproteins?
Proteins to which branched carbohydrates are attached
What are 2 examples of glycoprotein?
Laminin and Fibronectin
Where is laminin found?
In the basal lamina
What is fibronectin used for?
Cellular adhesion
What are the three types of connective tissue fibers?
Collagen
Elastin
Reticular
___________ is the most abundant protein of the body
Collagen
Collagen is formed by __________
Fibroblast
Nonelastic, acidophilic tissue with a tensile strength stronger than steel
Collagen Fibers
What are some examples of collagen fibers?
Cartilage, bone, connective tissue proper
Strings of amino acid come together to make _______
Tropocollagen
Each T strand has ___ fibrils associated with it
3
_________ _________ form an irregular network
Elastic fibers
Elastic fibers can stretch _____ times their original length
1.5
The core of elastic fibers are made of _________ but its surrounded by ________
Elastin proteins
Microfibrils
Do Elastic Fibers form a regular or irregular network?
Irregular (no orientation)
Type 3 collagen fibers make up a network that supports cells and allows filtration.. What are these fibers called?
Reticular fibers
_______ forms a network that holds cells in place but lets fluids come through
Reticular Fibers
Reticular Fibers are mainly found where?
In organs that filter
What are the 5 types of connective tissue cells?
Fibroblast Fibrocyte Macrophage Mast Cell Plasma Cell
______ are the most common connective tissue cell
Fibroblast
What are fibroblasts responsible for?
Synthesis of fibers and ground substance
What is a fibrocyte?
An older fibroblasts
Cells that were fibroblasts but are now inactive
What is a macrophage?
Phagocytes that act as our body’s first line of defense.
Macrophages are derived from __________
Blood monocytes
What is the function of Mast Cells?
Secrete ECF-A
-used in allergic reactions
Mast Cells contain what three components?
Heparin, histamine, and ECF-A
Mast Cells have surface receptors for ______
IgE
Which cells are the fewest in connective tissues?
Plasma cells
What is the function of plasma cells?
Synthesis of antibodies
Plasma cella are part of which system?
Immune system
_______ activates plasma cell?
Antigen (ag)
What are the three classifications of connective tissue?
Connective Tissue Proper
Special Connective Tissue
Supporting Connective Tissue
What are the three types of connective tissue proper?
Loose
Dense irregular
Dense regular
What are the 2 types of special connective tissue?
Adipose
Elastic
What are the 2 types of supporting connective tissue?
Cartilage
Bone
This type of connective tissue fills in spaces, supports epithelial tissue, surrounds lymphatic and blood vessels.
Loose areolar connective tissue
Loose areolar connective tissue contains which type of cells?
Fibroblast, macrophage, collagen fiber, elastic fiber, reticular fiber
What is the major component of loose areolar connective tissue?
Amorphous ground substance
How does loose areolar connective tissue respond to stress?
It is not resistant to stress - it will tear
Dense irregular connective tissue can be found where?
In the dermis of the skin
Dense Irregular Connective Tissue contains ________ collagen fibers and ______ cells
More
Less
How does Dense Irregular Connective Tissue respond to stress?
It resists stress in all directions
Dense regular connective tissue contains _____ collagen fibers and _____ cells.
More
Less
How does Dense Regular Connective Tissue respond to stress?
It can resist stress in one direction, but not well in others.
Collagen fibers are parallel to each other in what type of connective tissue?
Dense regular
Which type of connective tissue is composed of bundles of thick elastic fibers?
Elastic connective tissue
Where can elastic connective tissue be found?
In the ligamentum flava
How does Elastic Connective Tissue respond to stress?
It gives in all directions
Which type of connective tissue is specialized loose connective tissue that forms a framework in lymphoid and myeloid organs
Reticular connective tissue
Reticular connective tissues are made of _______
Reticular fibers
___________ connective tissue is like a net that hold cells in place but allow fluid to move through
Reticular
Fibroblasts of reticular connective tissue are called __________
Reticulocyte
___________ connective tissue contains a high concentration of amorphous ground substance with hyaluronic acid.
Mucous
Where is mucous connective tissue found?
In the Wharton’s Jelly of the umbilical cord
What are the functions of adipose tissue?
Energy storage
Shapes the body
Insulates the body
What are the 2 types of adipose tissue?
Unilocular (yellow)
Multilocular (brown)
Cells that appear as a thin layer of cytoplasm with a flattened nucleus
Unilocular Adipose Tissue
_____________ is primarily used for heat energy
Multilocular Adipose Tissue
What are the functions of cartilage?
Support soft tissue
Provide sliding areas for joints
Growth of bones
Where do you find cartilage?
In joints
How does cartilage respond to stress?
It can compress and snap back when it is healthy
What are the three types of cartilage?
Hyaline
Elastic
Fibrous
What is the primary substance in hyaline cartilage?
Water
Where is elastic cartilage found?
Auricle of the ear
Where is Fibrocartilage found?
In the intervertebral discs
Fibrocartilage always occurs in _________
Dense connective tissue
What are the three types of bone cells?
Osteoblast
Osteocyte
Osteoclast
What is the function of osteoblast?
Synthesis of osteoid (build up of bones)
________ is the organic component of bone
Osteoid
_______ are found on the surface of bone
Osteoblasts
What are osteocytes?
Mature bone cells
What is the function of osteoclasts?
Break down bone
Osteoclasts develop from _______
Monocytes
Why do we break down bone?
Release calcium into blood stream
Remodeling of bone
The area where bone is being removed is called ________?
Howship’s lacuna
What is the percentage of the inorganic portion of the bone?
50%
What is the inorganic portion of bone made of?
Hydroxyapatite crystals
Where are hydroxyapatite crystals located?
Between type 1 collagen fibers
What allows organic and inorganic material to interact?
The shell of hydration that surrounds the bone matrix
2 ways to look at bone
Decalcified bone
Ground bone
Periosteum & Endosteum are what two layers
External dense connective tissue
Internal osteogenic layer
How do periosteum and endosteum attach to the bone matrix?
Sharper’s Fibers
Which is thinner, periosteum or endosteum?
Endosteum
How are Haversian canals oriented?
They run along the long axis of the bone
How are Volkmanns canals oriented in ground bone?
They run at 90 degrees to the Haversian canal
The marrow cavity is made up of what?
Red marrow
Yellow marrow
Which type of bone undergoes the most remodeling?
Cancellous bones
What is yellow marrow?
Adipose
Physis AKA
Growth plate
physis is made of _________
Hyaline cartilage
How many Zones of Bone Growth are there?
5
ID the zone:
Classic hyaline cartilage
Zone of resting cartilage
ID the zone:
No bone growth, gain more and more chondrocytes
Zone of proliferation
ID the zone:
Chondrocytes take on water and cause bone to elongate
Zone of Hypertrophy
ID the zone:
Osteoblasts come in and bone starts to form
Zone of calcification
ID the zone:
Regular bone
Bone of diaphysis
What are the molecules that make up hydroxyapatite crystals
Calcium
Phosphate
Water
Howship’s Lacuna contain what cell?
Osteoclast
What cell is lipid droplet not membrane bound, and surrounded by reticular tissue
Unilocular adipose tissue
Adipose cells with many lipid droplets and many mitochondria
Multilocular Adipose Tissue
What does this describe: Avascular Uses diffusion No nerves or lymphatics Low metabolic rate Bear stress without permanent damage
Cartilage