Totally Terrific Tissues

Tissues A group of similar cells that work toward a common structure and function.

Cell Physiology most cells in a tissue will: Exhibit irritability (respond to a stimulus) Digest food Excrete wastes Reproduce Grow Metabolize Cells of a specific tissue type have additional specialized functions.

THERE ARE 4 TYPES OF TISSUE 1. EPITHELIA 2. CONNECTIVE 3. MUSCULAR 4. NERVOUS

I. EPITHELIAL Makes Linings, coverings, and glandular tissue 4 Functions: 1.Protection: Skin 2.Absorption: Food 3.Filtration: Cilia 4.Secretion: Oil, Sweat

5 Characteristics 1.Cells fit closely together in sheets or membranes 2.Always one unattached (free) surface 3. Lower surface rests on a basement membrane 4.No blood supply of their own 5.Regenerate easily when nourished

2 Ways to Classify 2.Cell Shape Squamous: Flat, like fish scales Columnar: Columns Cuboidal: Cubes, dice

Classification (cont.) 2. Cell Arrangement Simple: one layer Stratified: more than one layer

2. Connective Tissue 3 Functions 2 Characteristics Connects body parts Supports Binds 2 Characteristics Most have a great blood supply EXCEPT: tendons, ligaments, cartilage Connective cells make a non-living substance , called the matrix, that can be liquid, soft, or hard

5 Examples of Connective Tissue 1. Bone (Osseous) Bone cells live in cavities. They secrete a hard substance

5 Examples of Connective Tissue 2. Cartilage Larynx, attaches ribs to sternum, covers bone ends, external ear, vertebral discs

5 Examples of Connective Tissue 3. Dense Connective Strong and rope-like TENDONS: Connect bone to muscle LIGAMENTS: Connect bone to bone

5 Examples of Connective Tissue 4. Loose Connective Packing tissue, glue, squishy protection, insulation ADIPOSE = FAT

5 Examples of Connective Tissue 5. Blood Blood cells in a fluid (non-living substance) Transportation

3. Muscle Tissue Function : CONTRACT, shortens to produce movement

3 Types of Muscle Tissue Classification 1.Skeletal: Voluntary, long cells with stripes, lots of nuclei (cells look like a slinky in the microscope) Attached to bones

3 Types of Muscle Tissue Classification 2. Cardiac: Involuntary cells (you don’t have to control them) Cells have stripes, look broken, each cell has one nucleus

3 Types of Muscle Tissue Classification 3. Smooth: Found in walls of hollow organs Cells have NO stripes, look like thread, one nucleus Involuntary

Silly Skeletal Muscle Tissue Slimy Smooth Muscle Tissue Crazy Cardiac Muscle Tissue

4. Nervous Tissue Functions Tissue Classification Irritability and Conductivity Receive and send electrochemical impulses Tissue Classification NEURONS