Tissue essay Flashcards
Types of tissues
- Epithelial
- Muscluar
- Connective
- Nervous
Function of epithelial tissue
Covers the outside of the body and lines the organs and cavities within the body
Structure of epithelial tissue
Epithelial cells may be cuboidal, columnar, or squamous. Arrangement may be simple, stratified, or pseudostratified
Function of connective tissue
Binds and supports other tissues
Structure of connective tissue
Contains sparsely packed cella scattered throughout the extracellular matrix. The matrix contains fibers in a liquid, jellylike, or solid foundation
Types of connective tissue fibers
- Collagenous fibers
- Reticular fibers
- Elastic fibers
Collagenous fiber function
Provide strength and flexibility
Reticular fiber function
Join connective tissue to adjacent tissues
Elastic fiber function
Stretch and snap back to their original length
Cells of connective tissue
- Fibroblasts that secrete protein of extracellular fibers
- Macrophages that are involved in the immune system
Types of connective tissue
- Loose connective tissue
- Fibrous connective tissue
- Bone
- Adipose tissue
- Blood
- Cartilage
Loose connective tissue function
Binds epithelia to underlying tissues and hold organs in place
Loose connective tissue structure
Most widespread in the body. Has loosely arranged fibers
Fibrous connective tissue function
Found in tendons which attach muscles to bones, and ligaments which connect bones at joints
Fibrous connective tissue structure
Dense, a lot of collagenous fibers, resembles muscle
Bone function
Mineralized and forms the skeleton
Bone structure
Highly dense, compact, not bendable, made of osteocytes, endoskeleton, specific arrangement
Adipose tissue function
Stores fat for insulation and fuel (energy)
Adipose tissue structure
Similar to loose connective tissue but the cellular components are different (lipids)
Blood function
Connects parts of body. Passes oxygen and nutrients from one part to another
Blood structure
Composed of blood cells and cell fragments in the blood plasma. Liquid ECM, not a lot of fibers. Contains salts, WBC, RBC, platelets, and plasma
Cartilage function
A strong and flexible support material
Cartilage structure
Composed of chondrocytes. Semisolid jelly liquid ECM. Rubbery proteins and carbs
Muscular tissue function
Responsible for nearly all types of body movement
Muscular tissue structure
Consists of filaments of the proteins actin and myosin, enable muscles to contract (thick filaments slide over thin filaments and pull it together)
Types of muscular tissue
- Skeletal muscle
- Smooth muscle
- Cardiac muscle
Skeletal muscle function
Responsible for voluntary movement
Skeletal muscle structure
Bundles of cylindrical cells (fibers), multi-nucleated as they fuse together, striated, sarcromeres are banding in between fibers. Striated
Smooth muscle function
Responsible for involuntary body acitivites (EX: lines urinary, digestive, secretion organs, arteries )
Smooth muscle structure
Unstriated. Has spindle shaped cells. Controlled by the ANS
Cardiac muscle function
Responsible for the contraction of the heart
Cardiac muscle structure
Branched, striated, large nuclei, single nucleated cells, intercalated discs connect cells, controled by the ANS
Nervous tissue function
Functions in the receipt, processing, and transmission of information
Nervous tissue structure
Contains neurons that transmit nerve impulses and glial cells (support cells)
