Tissues of the Body

Classified by shape and arrangement

Types of tissue

Epithelial

Functions: 1) Protection: covers body and lines all body cavities; provides a protective shield for underlying tissues (e.g. epidermis) 2) Absorption: in some parts of the body it takes in certain materials (e.g. digestive tract) 3) Secretion: in some parts of the body epi. tissue is specialized to secrete certain products E.g. small intestine: some cells are specialized to secrete mucus 4) Excretion: in the kidney cells rid the body of materials 5) Surface transport: cilia on cells in the lungs move mucus and particles up and out 6) Sensory functions: Ex. taste buds in the mouth

Epithelial Stratified Transitional – many layers of cuboidal cells that flatten when stretched. Found in ureters, bladder and urethra. Pseudostratified columnar – cells are long and thin, look stratified but aren’t. Has cilia. Makes and secretes mucus. Found in Trachea, bronchi, nasal cavity, auditory tube.

Connective

Areolar – matrix of soft, sticky glue

Adipose – matrix of space and lipids

Bone – matrix of calcium and osteons

Fibrous – loose – matrix of collagen

Hemopoietic – matrix is liquid (plasma)

Connective Most have some sort of matrix, an intercellular material found between the cells consisting of fluids, fibers, and proteins. Function: varies depending on the structure and appearance of the tissue. Most help with support framework and transport.

Muscle Tissue CardiacSmoothSkeletal

Cardiac Striated Branched Inrercalated disks Involuntary

Smooth Involuntary Not striated Long, narrow fibers Single nuclei

Skeletal Multinucleated Striated Voluntary

Muscle Tissue Function: movement of the body. Have the ability to shorten.

Nervous Functions in rapid Communication and Control of the body

Neuron Conducting units

Neuroglia Connecting and supporting cells