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Tissues of the Body.

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Presentation on theme: "Tissues of the Body."— Presentation transcript:

1 Tissues of the Body

2 Key Terms Histology: the study of tissues. Tissues:
groups of cells which are similar in structure and which perform common or related functions.

3 Four Basic Kinds of Tissues
Epithelial Tissue Connective Tissue Muscle Tissue Nervous Tissue

4 Epithelial Tissue Epithelial Tissue Locations:
Covers the body Lines the cavities, tubes, ducts and blood vessels inside the body Covers the organs inside body cavities Epithelial Tissue Functions: Protection from physical & chemical injury, Protection against microbial invasion, Contains receptors which respond to stimuli, Filters, secretes & reabsorbs materials and Secretes serous fluids to lubricate structures.

5 Connective Tissue Connective Tissue: Connective Tissue Functions:
Most abundant & widely distributed tissue Connective Tissue Functions: Connects, binds and supports structures, Tendons, ligaments, etc. Protects & cushions organs and tissues, Insulates (fat) and Transports substances (blood).

6 Muscle Tissue Muscle Tissue: Muscle Tissue Functions:
Associated with the bones of the skeleton, the heart and in the walls of the hollow organs of the body. Muscle Tissue Functions: Movement Locomotion Maintains posture Produces heat Facial expressions Pumps blood Peristalsis

7 Nervous Tissue Nervous Tissue: Nervous Tissue Functions:
Main component of the nervous system, ie., brain, spinal cord & nerves. Nervous Tissue Functions: Regulates & controls body functions Generates & transmits nerve impulses Supports, insulates and protects impulse generating neurons.

8 Identify the following cell organelles
cell membrane cytoplasm nucleus nuclear membrane nucleolus chromosomes chromatin

9 Cell Organelles - Onion
Cell membrane

10 Cell Organelles - Onion
Cytoplasm

11 Cell Organelles - Onion
Nuclear Membrane

12 Cell Organelles - Onion
Nucleolus

13 Cell Organelles - Onion
Chromatin

14 Identify the five stages of mitosis
Stages of Mitosis, or the Cell Cycle: interphase prophase metaphase anaphase telophase

15 Interphase Metabolic phase Cell growth DNA replication
Centriole replication Protein Synthesis Visible Nucleus & nuclear membrane Visible nucleoli Chromatin

16 Prophase Nuclear membrane disappears Nucleoli disappear
Chromsomes appear Centrioles move to opposite sides of cell Spindle fibers from centrioles connect with chromosomes

17 Metaphase Chromosomes line up on equator of the cell

18 Anaphase Chromatids from each chromosome separate & are pulled to opposite sides of the cell.

19 Telophase Chromatids reach extremes of cell
Nuclear membrane reappears around each chromatid cluster Nucleoli reappear Cell plate appears between nuclei Cytokinesis occurs

20 Specific tissue types & representative cell types we will review:
epithelial Squamous Cuboidal Columnar connective Adipose Bone Hyalaine cartilage muscle nervous

21 Squamous Epithelium Simple – one cell thick
Forms solid layer of cells which line blood vessels, body cavities & cover organs in body cavities Stratified – multiple layers Forms epidermis

22 Cuboidal Epithelium Simple – one cell thick Roughly cube shaped
Cuboid Cells Simple – one cell thick Roughly cube shaped Duct Line ducts in kidneys, etc, where reabsorption and secretory activities take place. Cuboid Cells Duct

23 Columnar Epithelium Simple – one cell thick
Column shaped (long & narrow) Line digestive tract where reabsorption & secretion occurs. Pseudostratified – gives the appearance of more than one layer of columnar epithelial cells

24 Specific Connective Tissue Types:
Adipose Bone Hyalaine cartilage

25 Connective - Adipose Honeycomb or chickenwire appearance
Stores energy (fat) Insulates Supports & protects organs

26 Connective - Bone Tree ring-like appearance Supports & protects
Mineral storage Fat storage Blood cell production

27 Connective – Hyaline Cartilage
Supports while providing flexibility Absorbs compression between bones in joints (articular cartilage) Holds open respiratory passages Most abundant type of cartilage in body

28 Specific Muscle Tissue Types:
muscle (skeletal)

29 Muscle - Skeletal Muscle fibers (cells) long, parallel & cylindrical
With many nuclei (multinucleate) Striations (cross stripes run perpendicular to the cells Produce voluntary movement Locomotion Heat

30 Specific Nervous Tissue Types Nervous – Neuron
Branching cells with many long processes Large central nucleus Transmit impulses from one area of the body to other areas Regulate activities through neuron impulses

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