What is the definition of tissue in a human body?

Answer 1

Tissue in the human body:

1. Epithelial: Is made of cells arranged in a continuous sheet with one or more layers, has apical & basal surfaces.
   • A basement membrane is the attachment between the basal surface of the cell & the underlying connective tissue.
   • Two types of epithelial tissues: (1) Covering & lining epithelia and (2) Glandular Epithelium.
   • The number of cell layers & the shape of the cells in the top layer can classify epithelium.
   • Simple Epithelium - one cell layer
   • Stratified epithelium - two or more cell layers
   • Pseudostratified Columnar Epithelium - When cells of an epithelial tissue are all anchored to the basement Membrane but not all cells reach the apical surface.
   • Glandular Epithelium - (1) Endocrine: Release hormones directly into the blood stream and (2) Exocrine - Secrete into ducts.
2. Connective: contains many different cell types including: fibroblasts, macrophages, mast cells, and adipocytes. Connective Tissue Matrix is made of two materials: ground substance - proteins and polysaccharides, fiber - reticular, collagen and elastic.

   Classification of Connective Tissue:

   • oose Connective - fibers & many cell types in gelatinous matrix, found in skin, & surrounding blood vessels, nerves, and organs.
   • Dense Connective - Bundles of parallel collagen fibers& fibroblasts, found in tendons& ligaments.
   • Cartilage - Cartilage is made of collagen & elastin fibers embedded in a matrix glycoprotein & cells called chondrocytes, which was found in small spaces.
   • Cartilage has three subtypes:
     • Hyaline cartilage - Weakest, most abundant type, Found at end of long bones, & structures like the ear and nose,
     • Elastic cartilage- maintains shape, branching elastic fibers distinguish it from hyaline and
     • Fibrous Cartilage - Strongest type, has dense collagen & little matrix, found in pelvis, skull & vertebral discs.
3. Muscle: is divided into 3 categories, skeletal, cardiac and smooth.
   • Skeletal Muscle - voluntary, striated, striations perpendicular to the muscle fibers and it is mainly found attached to bones.
   • Cardiac Muscle - involuntary, striated, branched and has intercalated discs
   • Smooth Muscle - involuntary, nonstriated, spindle shaped and is found in blood vessels & the GI tract.
4. Nervous: Consists of only two cell types in the central nervous system (CNS) & peripheral nervous system (PNS):
   • Neurons - Cells that convert stimuli into electrical impulses to the brain, and Neuroglia - supportive cells.
   • Neurons - are made up of cell body, axon and dendrites. There are 3 types of neurons:
     • Motor Neuron - carry impulses from CNS to muscles and glands,
     • Interneuron - interpret input from sensory neurons and end responses to motor neurons
     • Sensory Neuron - receive information from environment and transmit to CNS.
   • Neuroglia - is made up of astrocytes, oligodendrocytes, ependymal cells and microglia in the CNS, and schwann cells and satellite cells in the PNS.

Development: All tissues of the body develop from the three primary germ cell layers that form the embryo:

• Mesoderm - develops into epithelial tissue, connective tissue and muscle tissue.
• Ectoderm - develops into nervous tissue and epithelial tissue.
• Endoderm - develops into epithelial tissue.

Cell Junctions:

• Tight Junctions - Form a seal between cells, define apical and basal sides of an epithelial cell
• Gap Junctions - An open junction between two cells, which allows ions, & small molecules to pass freely between the cells.
• Adherens Junctions - Link actin cytoskeletal elements in two cells.
• Desmosomes - Link keratin filaments in adjoining cells and resist shearing forces.
• Hemidesmosomes - Anchor keratin fibers in epithelial cells to the basement membrane through integrin anchors.

http://www.rapidlearningcenter.com/Biology/anatomy-physiology/04-Tissues-of-the-Human-Body.html

Answer 2

Human tissue is made up of thousands of cells that are located within the tissue. This is a matter of groups of cells formed to do a specific job,(at times), to make the tissue. Muscle tissue is made up of a banding of Actin and Myosin filaments, which are both proteins

Answer 3

a tissue is a group of cell that perform a function

Answer 4

4 (Epithelial tissue, Connective tissue, Muscular Tissue, and Nervous Tissues).

Answer 5

The four types of human tissue include epithelial, connective, muscular, and nervous.

Answer 6

a tissue is a group of similar cells together to perform a paricular function in an organism.

Answer 7

tissue is something that is in your body.