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Histology is the study of animal and plant tissues. Tissues are defined as cells with their ground substance acting together in the performance of a particular function. An organ is an aggregation of tissues that occur and function together to provide a division of labor. Epithelial tissue covers body's surface and most of the inner cavity. It also provides the essential functions of protection; containment of body fluids and transport in and out across body surfaces. Connective tissue is quite diverse and is not as cellular as other types of tissue. Connective tissue provides stiffness to the body (bone) and helps the body withstand tension, stress and shearing (twisting) forces.
The basic difference between connective tissue structure and epithelial structure are the following: 1) Cells of connective tissue are not directly attached to one another unlike epithelial cells; 2) Connective tissue is derived from mesenchyme unlike epithelial tissue which is derived from ectoderm (external layer of cells) and endoderm (internal layer of cells); and 3) Connective tissue consists of specialized cells surrounded by a matrix which is secreted by the cells.
Areolar connective tissue consist of a meshwork of thin fibers that interlace in all directions, giving the tissue both elasticity and tensile strength. It is commonly found in the papillary region of the dermis of skin and in the lamina propria of mucous membranes. While dense regular connective tissue occurs as cord or band-like structures or as broad sheet-like structures. It is composed primarily of collagen fibers in a parallel arrangement. This arrangement results structures that are flexible but have great tensile strength.
Ligaments are special type of dense regular connective tissue that connects bones to bones. They have similar structural arrangement to tendons, but differ in their yellow color, which is due to the abundance of elastic fiber in the tissue. The elastic fibers are stained a dark brown-red with orcein. Elastic fibers provide ligament with remarkable elasticity.
There are costs to bearing and believing in such a secret. These costs are manifested in many ways. There are the psychosomatic costs Jesse endures, his impotence, his weakness around the black boy in the jail, his tremors at the thought of Otis, "Now the thought of Otis made him sick. He began to shiver." There are also the psychological costs that Jesse is plagued by, the self-delusion associated with
" (Volpicelli-Daley and Levey, 2003) Prior to visualization of the molecule of interest it is necessary to "fix and section the brain tissue. Double-labeling immunofluorescence is stated to detect "localization of a protein of interest as well as the distribution of the protein relative to another marker such as a neurochemical or organelle marker." (Volpicelli-Daley and Levey, 2003 Fluorescence imaging labeled tissue through use of confocal makes provision of "high-resolution analysis
1993). Using a rigid-tube bronchoscope, the bronchial biopsies were taken under local anaesthesia from two different airway levels: (a) inside the right upper lobe bronchus, and (b) at the opening of the right middle lobe (Laitinen et al. 1993). Preparations of the specimens thereby obtained were completed for light as well as electron microscopy; the researchers also used slot grids 1 x 2 mm which facilitated photography of a large
It is of extreme importance in medicine to know accurately the anatomical changes that take place in a certain disease for diagnosis and treatment. The man who created this science was Morgagni who taught us to think anatomically in our approach of a disease. Morgagni studied at Bologna under Valsalva and Albertini, who are notable persons themselves in the history of medicine. Morgagni did this in the form of letters
Rinpoche In The Tibetan Book of Living and Dying, Sogyal Rinpoche (2002) distills the essence of Tibetan Buddhist teachings into a format digestible for a modern Western audience. The central premise of The Tibetan Book of Living and Dying is that death can be a "teaching for us all," (Rinpoche, 2002, p. 3). The title of Rinpoche's book refers to the Tibetan Book of the Dead, which describes the bardo, of
Diamond Marian Diamond addressed the nature vs. nurture issue so long debated by researchers and scientists by actually observing the effects of living in different environments on young rats. The beginnings of her research with Donald Head occurred in the 1960's, a time when the brain was not viewed as plastic. When presenting the results of their early research demonstrating a small but significant thicker cerebral cortex in rats raised in