Biological tissue

In zootomy, biological tissue is a group of biological cells that perform a similar function. The study of tissues 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.

There are four basic types of tissue in the body. These compose all the organs, structures and other contents.

  • Epithelium - Lines, covers, protects, absorbs and secretes.
  • Connective tissue - As the name suggests, connective tissue holds everything together. Blood is considered a connective tissue.
  • Muscle tissue - Muscle cells contain contractile filaments that move past each other and change the size of the cell.
  • Nervous tissue


In the News

Powerful new method allows scientists to probe gene activation
Researchers have developed a powerful new method to investigate the discrete steps necessary to turn on individual genes and examine how the process goes wrong in cancer and other diseases. The finding allows scientists to investigate the unfolding of DNA, a process required for gene activation.

How does Santa do it
An advanced knowledge of electromagnetic waves, the space-time continuum, nanotechnology, genetic engineering, and computer science easily explains Santa’s abilities to deliver presents to millions of homes and children in just one night, according to professor of mechanical and aerospace engineering, Larry Silverberg, at North Carolina State University.Silverberg explains that Santa has a personal wireless connection [...]

Breast-feeding Overcomes A Genetic Tendency Toward Ear Infections, Sci
Breast-feeding protects children otherwise made susceptible to ear infections by abnormalities in specific human genes, researchers at the University of Texas Medical Branch at Galveston have discovered.

New E-waste Recycling Technology
With megatons of obsolete personal computers, old cell phones and other waste electrical and electronic equipment piling up every year, scientists in China report development of a much-needed new recycling and recovery technology for one of the most troublesome components of e-waste -- printed circuit boards (PCBs).

Tool To Assess Vulnerability And Efficiency Regarding Infrastructure S
Natural disasters, accidents and the failure of aging equipment can have serious consequences for transportation networks, electrical power supply chains and telecommunications networks. Researchers have developed a computer-based tool that identifies the most important components of these critical infrastructure networks.

U. Of Colorado Researcher Identifies Tracks Of Swimming Dinosaur In Wy
The tracks of a previously unknown, two-legged swimming dinosaur have been identified along the shoreline of an ancient inland sea that covered Wyoming 165 million years ago, according to a University of Colorado at Boulder graduate student.

Researchers Compare Chicken, Human Genomes: Analysis Of First Avian Ge
An international research consortium has found that chickens and humans share more than half of their genes, but that their DNA sequences diverge in ways that may explain some of the important differences between birds and mammals.

[Odd] A Romanian couple has named their son Yahoo as a sign of gratitu
Daily Libertatea said on Thursday Cornelia and Nonu Dragoman, both from Transylvania, met and decided they were meant for each other following a three-month relationship over the net.They married and had a baby this Christmas, whom they decided to name after one of the worldwide web's most popular portals."We named him Lucian Yahoo after my father and the net, the main beacon of my life,"Cornelia Dragoman was quoted as saying.

3-D Computer Mapping Lowers Radiation Dose In Treating Kids With Heart
A University of Michigan Cardiovascular Center team is reporting high levels of success, and lowered risk and radiation dose, from a new approach to treating children with rapid heartbeats and other heart rhythm conditions.

Education: Art Hazards
Guidelines for the safe use of art and craft supplies in accordance with the California Education Code, which "prohibits schools from ordering or purchasing any product that contains toxic or carcinogenic substances for use in grades K-6."Includes general guidance (such as avoiding inhalation hazards and solvent-based products) and a detailed list of prohibited products. From the California Office of Environmental Health Hazard Assessment (OEHHA).




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