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The most abundant type of tissue in the body.
Separated from each other by intercellular material.
Known as extracellular matrix.
This is a nonliving matrix.
Seven subgroups of connective tissue
1. Areolar Connective Tissue is a loose tissue.
The "loose packing" material of most organs and other tissues.
Areolar connective tissue contains 3 types of protein fibers: collagen, reticulum, & elastin.
3. Fibrous Connective Tissue
Strong, white collagenous fibers in parallel rows. (i.e., Tendons)
Characterized by strength and inelasticity
4. Cartilage (chondrocytes).
Varies by its location & role
Hyaline Cartilage - found at articulating surfaces & is firm & smooth
Fibrocartilage - more flexible & supple
The types of cartilage depends on the relative amounts of collagen, elastin, & ground substance
Ground substance is composed of non fibrous protein & other organic molecules and fluid.
Increased amounts of collagen or elastin allow cartilage to spring back after being compressed. Cartilage heals slow after injury due to no blood circulation.
Forms the major skeletal tissue of the embryo before it is replaced by bony tissue.
2. Adipose Tissue = Fat tissue
Lipids take up less space per calorie then carbohydrates or proteins.
Hard, connective tissue
The strength & rigidity allow bone to support & protect other tissues & organs
Classified according to shape
Longer than they are wide
Each consist of a diaphysis (shaft), an epiphysis at the end of each bone, & an epiphyseal plate.
About as broad as they are long
Thin, flattened shape
Bones that don't fit other 3 categories such as: vertebrae and facial bones.
Large cavities and Small
Small cavities include the epiphyses of long bones and throughout the interior of other bones.
These spaces are filled with yellow marrow (mainly adipose tissue) or red marrow (the site of blood formation).
Cancellous or Spongy Bone, and Compact Bone
Compact bone is essentially solid
Cancellous bone has spaces between the plates of the bone and resembles a sponge.
Unlike cartilage, bone has a rich blood supply and can repair itself much more rapidly than cartilage
Matrix between cells is liquid.
Liquid allows the blood to flow through the body rapidly.
Carries nutrients, oxygen, waste products, and other materials
7. Hematopoietic Tissue
located in the marrow cavity of bones
Also in the spleen, tonsils, and lymph nodes