Biology lab: cells and tissues

in connective tissue the cells are often spaced far apart

is to make the fibers in the extracellular matrix: collagen and elastin

are like cables which serve to strenghten the tissue, leather is simply cleaned and processed collagen, because collagen is made of very large and complex proteins, it can take months to make new collagen.

which is similar to rubber bands which allow the tissue to be stretched and go back to its original shape.

white blood cells, function is to protect against infection

cells and fibers are suspended in, which is composed of water with dissolved nutrients, gasses, ions, etc

differs from connective tissue in that it has a lot more collagen and the collagen fibers are arranged in tight bundles all going in the same direction, it gives the tissue is tremendous strength

dense regular connective tissue, attach muscles to bones

dense regular connective tissue, attach bones to each other

the outermost layer of the skin, is a stratified squamous epithelium

made up of many flat cells, the outer layer is made up of dead cells which are constantly flakingoff. this tissue protects the body from mild abrasion, infection, and dehydration

middle layer of the skin. it is dense fibrous connective tissue.

within this tissue are many collagen which are bundled together, which provide strength. leather is simply a cleaned and processed dermis, embedded within the dermis are other organs such as hair, sweat glands, etc.

the deepest layer of skin, this is a type of connective tissue called adipose tissue.

contains many fat cells, it provides cushioning as well as insulation, almost all the body's fat is stored in the hypodermis

epithelia, connective tissue, muscle tissue, and nervous tissue

has only one layer of cells

a tissue where the cells are arranged as sheets

has two or more layers of cells