Chapter 17 Flashcards
Connective tissue
Implies that tissue connects parts of the body together, and to some extent that description is true
General connective tissue
Comprised of cells, fibers, ground substance, and extracellular fluid
Subdivided into irregular connective tissue, and regular connective tissue
Ground substance
fluidlike material in general connective tissue
Extracellular fluid
filrate of blood plasma
Irregular connective tissue
Epithelium has no blood vessels
Named irregular because its fibers run in all directions
Fibroblast
one of the cells that sprouts or forms fibers (these are known as collagen fibers)
Fiber that attaches the tooth to its socket
Collagen fibers
These originate from the bone marrow
B-lymphocyte and T-lymphocyte
B-lymphocyte
Originates from the bone marrow and then passes to many lymphoid organs, such as the spleen, lymph nodes, etc
T-lymphocytes
Originate from bone marrow but then migrate to the thymus gland
Macrophages
Act as scavengers and devour dying cells and microorganisms
Fat cells (adipocyte)
Producing adipose tissue (fat)
Regular connective tissue
Collagen fibers run parallel with one another with fibroblasts squeezed between them
Found as tendons and ligaments
Tendons attach
Muscle to bone
Ligaments attach
Bone to bone
Special connective tissue
Cartilage
Bone
Blood
Cartilage
A noncalcified supporting component of the body
What is cartilage composed of
Chondroblasts and chondrocytes
Three types of cartilage
Fibrocartilage, elastic cartilage, and hyaline cartilage
Fibrocartilage
Functions as a cushioning substance
Found in intevertebral discs between vertebrae of the spinal column, and the TMJ
Elastic cartilage
Found in the firm but flexible part of the ear as well as the epiglottis over the larynx and septum of the nose
Hyaline cartilage
Firmer and can be seen in the larynx, trachea, and certain parts of bones
How many ways can cartilage grow
2
Appositional growth and interstitial growth
Appositional growth
Grows by adding to its surface
Interstitial growth
The chondrocytes found inside the cartilage undergo cell division and enlargement and cause growth from within
Without this it would not be possible for long bones of the body to grow in length
Bone
Osteoblasts or osteocytes
Hydroxyapatite
Microscopic crystals in bone
Intramembranous bone formation
Bone forms in regular connective tissue by some of the primitive mesenchymal cells becoming osteoblasts. Soon surrounded by periosteum
Endochondral formation
Cartilage is first formed, covered by perichondrium. Cartilage is then invaded by bone cells, which replace the cartilage with bone. Bone replaces the cartilage in two end sections called the epiphyses and a center section, the diaphysis. Between those is the epiphyseal plate
Epiphyseal plate
block of cartilage between each epiphysis and the diaphysis
What happens when the pituitary gland stops producing growth hormone
the epiphyseal plate disappears and the bone is no longer in three sections but unite as one
Bone structure
About 50% hydroxyapatite crystals with the rest collagen, ground substance, and water
Hard structure between the periosteum and the marrow cavity
Cortical plate or plate
Coritical plate
Has numerous blood vessels running through it to keep it vital
Osteoclasts
Bone-destroying cells
Cardiovascular system
Blood is carried by the arteries, veins, and capillaries, as well as the heart that pumps it
Two components that make up blood
Fluid part and cellular part
Fluid part of blood
called plasma
Cellular part of blood
divided into red blood cells, white blood cells, and platelets
Red blood cells
Every cubic millimeter of blood contains 4.5 to 5 million red blood cells
Bi-concave discs
Have hemoglobin
Hemoglobin
iron-containing element
Has the ability to attach oxygen molecules to its structure and carry them from the lungs to the cells where oxygen is needed
Life span of a red blood cell
about 4 months
Anemia
Any significant decrease in the number of red blood cells, or their ability to carry oxygen
Sickle cell anemia
In African Americans, the red blood cells are C shaped rather than round and lacks sufficient hemoglobin