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Anatomy

Tissues

TermDefinition
tissues are groups of similar specialized cells that have a common function
four types of tissue epithelial, connective, muscle, nervous
epithelial tissue (avascular - no direct blood supply) covers surfaces and lines hollow organs and tubes in the body; protection, absorption, filtration, and excretion
number of layers (epithelial) simple - 1 layer of cells stratified - more than 1 layer of cells
shape of cells (epithelial) squamous, cuboidal, columnar
squamous flat or "squashed" nucleus appears flat in cell
cuboidal cube shape cells are as tall as they are wide nucleus is round and in center of cell
columnar column/rectangle shape cells are taller than they are wide nucleus is oval
not all epithelial tissue fits into this simple classification system pseudostratified epithelium, transitional epithelium (urinary bladder), glandular epithelium (endocrine sweat, oil gland)
stratified squamous epithelium (hollow space) protects underlying tissues because of its many layers found in skin, mouth, esophagus, and vagina
connective tissue (highly vascular, large nerve supply) most abundant and widely distributed tissue type in the body
functions of connective tissue enclose and separates other tissues connects tissues to one another (ligaments and tendons) protects/support (bone) storage (adipose tissue and bone) cushions/insulates (adipose tissue) transports (blood)
areolar connective tissue (loose connective tissue) liquid substance found in dermis of skin, mucous membranes, space around organs
adipose tissue (loose connective tissue) stores a small amount of fat found in deep to dermis, around organs
dense regular connective tissue (dense connective tissue) collagen fibers make this tissue very strong makes up tendons and ligaments
cartilage cells are called chondrocytes secrete the gel-like ground substance around themselves no blood vessels
hyaline cartilage collagen fibers found at ends of long bones, connects ribs to sternum, end of nose, embryonic skeleton
elastic cartilage come in pairs maintains its shape after bending found in external ear and the epiglottis
fibrocartilage strongest of 3 found in: intervertebral disks, pubic symphysis, meniscus of the knee
Created by: hharki