Chapter 4.3: Tissues

Most diverse Never exposed to outside Vascular—have blood vessels Receptors for pain, pressure and

temperature

Connective Tissues

Figure 4.7

Support/Protection Transportation Storage of energy reserves (Adipose cells—

AKA fat cells) Defense

Functions of Connective Tissue

Figure 4.8

Cell Types Fibroblasts Most abundant Produce and maintain connective tissue Macrophages Engulf damaged cells and wastes Adipocytes Fat cells Mast Cells Release chemicals to start immune response

Connective Tissue Proper

Collagen Fibers Strong and flexible Elastic Fibers Will stretch Reticular Fibers Thin

Connective Tissue Fibers

Fills in space between cells Slows bacteria and pathogens

Ground Substance

Figure 4.8

Genetic Abnormal fibrillin—gives connective tissue

strength and elasticity Tall with abnormally long arms, legs and

fingers Abnormal cardiovascular system Weak aorta—may burst Sudden, fatal loss of blood

Marfan’s Syndrome

Areolar Tissue Least specialized Increased blood supply Separates skin from muscle Pads Allows movement Supplies blood to epithelia

Loose Connective Tissue

Figure 4.9a

AKA: Fat Loose Connective Tissue Padding Shock absorption Insulation Energy reserve Collects in sides, buttocks, breasts and

abdomen

Adipose Tissue

Figure 4.9b

Weight loss = deflated adipocytes Easily regain these cells b/c the cells are

still there Liposuction—remove adipocytes

Weight Control

Mostly collagen Tendons—attach muscles to bone Ligaments—attach bone to bone

Dense Connective Tissue

Figure 4.9c