TissuesTissues (click for research on cells (Histology) Chapter 5.

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Presentation transcript:

TissuesTissues (click for research on cells (Histology) Chapter 5

Learning Targets By the end of today, you should be able to: Name the 4 different types of tissues in the body. Give examples of the 4 different types of tissues and where they may be found. Contrast the 4 different types of tissues.

Teamwork The human body contains ~ trillion cells. No one cell can carry out all bodily functions by itself. Cells specialize (take on special structures to perform unique functions). Tissue = Group of cells with a similar structure and function. The study of tissues is known as histology.

Tissues There are 210 different types of cells in the human body, each classified as one of 4 types of tissue: 1.Epithelial ( covering/lining ) 2.Connective ( support ) 3.Muscle( movement ) 4.Nervous( control )

Epithelial Tissue Covers and forms internal lining of organs (stomach, trachea, blood vessels, etc.) Always has an exposed surface with the other surface anchored to connective tissue One epithelial cell

Epithelial Tissue Cells readily divide, continually replaced Tightly packed – form a good protective barrier against injury, microbes May contain sensory receptors May secrete hormones, enzymes, mucous Absorbs nutrients in intestines Filters air in lining of lungs (cilia)

Epithelial Tissue – Skin side view top view

Connective Tissue Wide variety of form and function: blood, bone, cartilage, fat, tendons, ligaments, etc. Connects body tissues and organs together, offers support, nutrients, transport, protection, storage Cells are spaced far apart within an extracellular matrix (non-living material outside cells) adipose tissue (fat) blood

Connective Tissue bone cartilage fibrocartilage Fibrous connective tissue

Muscle Tissue Only cells able to contract (shorten), and thus move. Functions: Movement of skeleton Posture Facial expressions Producing body heat Movement of food through intestines Pumping of blood 3 types: 1.Skeletal 2.Smooth 3.Cardiac skeletal muscle smooth muscle cardiac muscle

Nervous Tissue Found in brain, spinal cord, and nerves throughout body Transmits impulses (messages) through long wire-like cellular extensions Functions: Sensory perception Integration (processing/interpretation) Response (both voluntary and involuntary)

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