Respond quickly transmit coded information rapidly to

This preview shows page 18 - 21 out of 29 pages.

Respond quicklyTransmit coded information rapidly to other cellsNeuroglia (glial)Protect and assist neurons“Housekeepers” of nervous systemNeuron partsNeurosoma (cell body)Houses nucleus and other organellesCell’s center of genetic control and protein synthesisDendritesMultiple short, branched processesReceive signals from other cellsTransmit messages to neurosomaAxon (nerve fiber)Sends outgoing signals to other cellsCan be more than a meter longNerves are essentially bundles of fibersMUSCULAR TISSUEMuscle tissue—elongated cells specialized to contract in response to stimulation- another excitable tissuePrimary job is to exert physical force on other tissues and organsCreates movements such as:body and limb movementdigestion,waste eliminationbreathingSpeechblood circulationImportant source of body heatThree types of muscle:Skeletal,Cardia, and Smooth Muscle TissueSKELETAL MUSCLELong, threadlike cells called muscle fibers18
Most attach to boneExceptions: in tongue, upper esophagus, facial muscles, somesphincter musclesCHARACTERISTICS:Contains multiple nuclei adjacent to plasma membraneStriations—alternating dark and light bandsVoluntary—conscious control over skeletal musclesCARDIAC MUSCLE: LIMITED TO THE HEARTCells: Myocytes or cardiocytes: shorter, branched, & notchedOne centrally located nucleus surrounded by light-stainingglycogen&Intercalated discs join cardiocytes end to end: Electrical & mechanicalconnectionStriated and involuntarySMOOTH MUSCLE: (VISCERAL MUSCLE)Forms layers of digestive, respiratory, & urinary tract: Propels contents through an organ, regulates diameter ofblood vessels, etc.Relatively short,fusiform cellsw/ one central nucleusCELL JUNCTIONS, GLANDS, AND MEMBRANESExpected Learning OutcomesDescribe the junctions that hold cells and tissues together.Describe or define different types of glands.Describe the typical anatomy of a gland.Name and compare different modes of glandular secretion.Describe the way tissues are organized to form the body’s membranes.Name and describe the major types of membranes in the body.19
CELL JUNCTIONSLook at diagram, and review pages 161, 163-164Cell junctions—connections between one cell and anotherAll cells (except blood and metastatic cancer cells) are anchored to each other or their matrix by intercellularjunctionsResist stress and communicate with each otherGLANDSGland—cell or organ that secretes substances for use elsewhere in the body or releases them for eliminationfrom the bodyComposed of epithelial tissue in a connective tissue framework and capsuleMay produce product synthesized by the gland (digestive enzymes) or products removed from tissuesand modified by the gland (urine)Secretion—product useful to the bodyExcretion—waste productEx. Kidney is a type of glandENDOCRINE AND EXOCRINE GLANDS- TWO BROAD CATAGORIESExocrine glandsconnect to surfacewith a duct (epithelial tube that conveys secretion to surface)

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 29 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
Dr.Langer
Tags

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture