Everything about Body Tissue totally explained
Biological tissue is a collection of interconnected
cells that perform a similar function within an organism.
In other words it's a group of cells working together mainly inside an organ.
The study of tissue is known as
histology, or, in connection with disease,
histopathology.
The classical tools for studying the tissues are the
wax block, the
tissue stain, and the
optical microscope, though developments in
electron microscopy,
immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades.With these tools, the classical appearances of the tissues can be examined in health and disease, enabling considerable refinement of clinical diagnosis and prognosis.
Animal tissues
There are four basic types of tissue in the body of all
animals, including the human body and lower
multicellular organisms such as
insects. These compose all the organs, structures and other contents.
- Epithelium - Tissues composed of layers of cells that cover organ surfaces such as surface of the skin and inner lining of digestive tract: the tissues that serve for protection, secretion, and absorption.
- Connective tissue - As the name suggests, connective tissue holds everything together. Connective tissue is characterized by the separation of the cells by non-living material, which is called extracellular matrix. Bone and blood are connective tissues.
- Muscle tissue - Muscle cells are the contractile tissue of the body. Its function is to produce force and cause motion, either locomotion or movement within internal organs. Muscle tissue is separated into three distinct categories: visceral or smooth muscle, which is found in the inner linings of organs; skeletal muscle, which is found attached to bone in order for mobility to take place; and cardiac muscle which is found in the heart.
- Nervous tissue - Cells forming the brain, spinal cord and peripheral nervous system.
Plant tissues
Examples of tissue in other
multicellular organisms are
vascular tissue in
plants, such as
xylem and
phloem. Plant tissues are categorized broadly into three tissue systems: the
epidermis, the
ground tissue, and the
vascular tissue. Together they're often referred to as
biomass.
Epidermis - Cells forming the outer surface of the leaves and of the young plant body.
Vascular tissue - The primary components of vascular tissue are the xylem and phloem. These transport fluid and nutrients internally.
Ground tissue - Ground tissue is less differentiated than other tissues. Ground tissue manufactures nutrients by photosynthesis and stores reserve nutrients.Further Information
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