- know what the three types of dense CT are (regular, irregular, elastic)
- know that the main protein in the ECM is collagen
- know the visible differences between dense regular and irregular CT
- know that these tissues are populated by fibroblasts
- know where you find dense regular CT and its functions
- know where you find dense irregular CT and its functions
- know where you find dense elastic CT and its functions
This packet goes over the three types of dense connective tissue propers (regular, irregular, elastic). By the time you are finished with this packet you should be able to differentiate between them based on their apperance and know their functions.
The last two packets (areolar & reticular, adipose) covered the loosely arranged types of connective tissue proper. This one will cover the more densely arranged types of connective tissue proper called: dense irregular, dense regular, and dense elastic.
Dense regular connective tissue is composed of fibroblasts that excrete high amounts of collagen fibers. The collagen fibers are stacked on one another in a neat parallel array. This type of tissue is what forms the tendons and ligaments of the human body. Being that this is heavily comosed of collagen this tissue is very resistant to tensile forces.
Dense irregular connective tissue also contains fibroblasts and collage but differs in its arrangement. The collagen fibers travel in all directions which is vital to this tissue's function. Dense irregular CT is used to form the capsules that surround our internal organs such as the pericardium or the renal capsule. The unorganized array of collagen allows this tissue to conform to the exact shape of the organ. These capsules are important for protecting the organs and for preventing leakage into or out of the organ.
Dense elastic CT is found in the large arteries of the body; the aorta would be the largest example. Arteries need this tissue within its walls because of the high pressure and velocity of the blood flowing through them. This tissue allows for the arteries to expand under high pressure and recoild under low pressure which is important for promoting smooth blood flow. As we age the fibers within start to cross-link which makes the arteries more stiff and tight whihc winds up causing elevated blood pressure (hypertension).
Source: The mind of Aaron
This video will cover the three types of dense connective tissue proper: regular, irregular and elastic
Source: Self made with images from Marieb & http://www.udel.edu/biology/Wags/histopage/colorpage/colorpage.htm
Here are some images for you to study, pay attention to the arrangement of the fibers
Source: self made with images from http://www.udel.edu/biology/Wags/histopage/colorpage/colorpage.htm