Question 6 Midterm Flashcards
Which are the fundamental types of connective tissues
- Loose
- Dense
- Cartilage
- Bone
- Blood
Types of loose connective tissue
1.Areolar
2. Adipose
3. Reticular
Areolar connective tissue
- Support and bind other tissue types
- Hold body fluids
- Most widely distributed type of connective tissue
- Has a lot of hyaluronic acid
- Helps provide nourishment
Example of areolar connective tissue
1.Connective tissue that most epithelium rest on
2.Adipocytes often accumulate in this tissue
Adipose tissue
Commonly referred to as fat
House adipocytes
Brown fat and white fat
Function of adipose tissue
- Provide cushioning
- Heat
- Fuel storage
Brown fat
1.High in mitochondria
2.Makes heat using lipid fuels
3. Babies use it to generate body heat since they cannot shiver
Locations of brown fat
- Around spine,
Collarbones, neck, abdomen - Babies
White fat
Energy storage,
Protection,
Insulation
Reticular connective tissue
1.Fine collagen fibers
2.Make a network(soft skeleton)
3. Support WBC, Macrophages, Mast cells
4. Has gel-like ground substance
WBC
Provide immune response when pathogens are detected
Mast cells
cluster along blood vessels. detect microorganisms, initiate local inflammatory response
Macrophages
Large immune cell. Devours foreign/harmful materials
Adipocytes
Fat cells
Example of where to find reticular loose connective tissue
3.Supports the lymphoid organs like the spleen, lymph nodes and bone marrow
Where to find white fat?
Beneath skin in subcutaneous tissue,
Abdomen,
Types of dense connective tissues
Dense regular
Dense irregular
Elastic
Dense regular connective tissue
Tensile strength in one direction
Parallel collagen fibers
Example of dense regular connective tissue
Tendons, ligaments, aponeuroses
Tendons
Attach Muscle to bone
Aponeuroses
Flat, sheet like tendons that attach muscles to bone, or attach muscles to muscles
Cartilage resists which two things?
Tension and compression
How does cartilage receive nutrients
Diffusion from blood vessels in connective tissue layer
What percentage of cartilage is water
80%
Properties of connective tissue
1.EXTRACELLULAR MATRIX
- COMMON ORIGIN (MESENCHYME)
Ligaments
Bind bones to bones at joints
Dense irregular connective tissue function
1.Resist tensile strength from many directions
2. Irregularly arranged collagen fibers (made by fibroblasts)
Location of dense irregular connective tissue
- Dermis of skin,
- Submucosa of digestive tract
Dense elastic connective tissue
High proportion of elastic fibers
Allows for tissue recoil after stretching
Where to find dense elastic connective tissue
- Walls of arteries
- Walls of bronchial tubules
- Ligaments associated with vertebral column
Types of cartilage
- Hyaline cartilage
- Elastic cartilage
- Fibrocartilage
Hyaline cartilage
1.Imperceptible network made by chondroblasts
2.Most abundant cartilage in body
3. Lots of collagen fibers
4. Glassy appearance
Location of hyaline cartilage
- Fetal skeleton
- Epiphyseal plates
- Coastal regions of ribs
What happens to cartilage during old age?
Loses ability to divide,
Injured cartilage heals slowly,
Old cartilage can ossify
Is adipose tissue highly vascularized?
Yes
How much of the body is adipose tissue in the average person
18%
Fibrocartilage
1.Matrix similar but less firm than in hyaline cartilage.
2. Thick collagen fibers predominate.
Function of fibrocartilage
Tensile strength lets it absorb compressive shock
Location of fibrocartilage
Pubic symphysis
Intervertebral discs
Disc at knee joints
Elastic cartilage
1.Similar to hyaline cartilage but more elastic fibers in matrix
2.More flexible than hyaline cartilage
Elastic cartilage locations
Supports pinna and epiglottis
Epiglottis
Flap that closes over windpipe to prevent food from entering the airway
Bone
1.Hard calcified matrix
2.Contains lots of collagen fibers
3.Very well vascularized
4. Made of osteocytes that lie in lacunae
Bone location
Skeleton, that provides levers for movement
Blood
Fluid connective tissue: has RBCs, WBCs, Plasma
RBCs
Help transport O2
Aka as erythrocytes,
Concave shape
WBCs
Leukocytes
Immune protection,
Help protect sites of damage
Plasma
Suspends the formed elements of blood,
Liquid
Allows for movement
Thrombocytes
Platelets used for clotting
Similarities and differences between epithelial tissues and connective tissues
- Both are various cells working together to perform a common function
- Epithelial tissues are avascular whereas connective tissue have different vascularization. Hyaline cartilage is avascular but areolar connective tissue is highly vascular
- Epithelial tissues and connective tissues have different functions. Epithelium cover, line, protect and make glands.
Connective tissue nourishes, binds, supports, stores energy and helps transport substances
Intercellular junctions types
Tight junctions (prevent leakage, impermeable)
Anchoring junctions (resist shear stress, not impermeable)
Gap junctions ( communicating junctions in adjacent cells, lets cytoplasms interact, tunnel)
Tissue types
Epithelial
Connective
Muscular
Nervous
Types of epithelial tissue
Covering and lining
Glandular epithelium
Types of muscle
- Skeletal muscle
- Smooth muscle
- Cardiac muscle
Types of nervous tissue
Neurons (communication cell in nervous system with axon, dendrites, body and synaptic knobs)
Neuroglia (support cells)
Basement membrane
Boundary between epithelium and connective tissue
Has reticular lamina and basal lamina
Simple
One layer
Stratified
More than one layer
Pseudostratified
Appearance of layers
Reticular fibers
Fine collagen fibers make fine network
Collagen
Stronger than steel
Made by cross-linked fibrils wound together
Elastic fibers
Made by elastin protein
Gives rubbery and resilient quality to matrix
Lacunae
Small space, cavity or depression, hold bone cells or cartilage cells
Osteocytes
Mature bone cells, occupy lacunae, maintains matrix
Stem cells that make bone
Osteoprogenitor cell
Osteoblasts
Immature cells that make bony matrix,
Responsible for bone growth
Osteoclasts
Large cells that resorb bony matrix, break down bony matrix
Osteon
Structural unit of compact bone. Makes parallel cylinder to long axis of bone. Contains blood vessels and nerves in the middle
Adenoma
Neoplasm of glandular epithelium
Carcinoma
Cancer in an epithelium