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

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Presentation on theme: "TissuesTissues (click for research on cells (Histology) Chapter 5."— Presentation transcript:

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

2 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.

3 Teamwork The human body contains ~50-100 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.

4 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 )

5 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

6 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)

7 Epithelial Tissue – Skin side view top view

8 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

9 Connective Tissue bone cartilage fibrocartilage Fibrous connective tissue

10 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

11 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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