![]() Carotenes contribute yellow and red coloration. ![]() Produce melanin Melanin Insoluble polymers of tyrosine derivatives found in and causing darkness in skin (skin pigmentation), hair, and feathers providing protection against sunburn induced by sunlight.In addition multiple isoforms of subtypes have been found which may be due to gene duplication. Alpha-keratins have been classified into at least 20 subtypes. Two major conformational groups have been characterized, alpha-keratin, whose peptide backbone forms a coiled-coil alpha helical structure consisting of type I keratin and a type II keratin, and beta-keratin, whose backbone forms a zigzag or pleated sheet structure. Produce keratin Keratin A class of fibrous proteins or scleroproteins that represents the principal constituent of epidermis hair nails horny tissues, and the organic matrix of tooth enamel.Cell Cycle (stimulated by epidermal growth factor) Undergo continuous mitosis Mitosis A type of cell nucleus division by means of which the two daughter nuclei normally receive identical complements of the number of chromosomes of the somatic cells of the species.The primary role of the skin is to serve as a protective barrier between the internal body and the external environment it also protects the body from excessive fluid loss. Connective Tissue: Histology, muscles, and nerves. Connective tissues consist of cells and an extracellular matrix. The main function of connective tissues is to provide structural support to organs. Surface Epithelium: Histology, exocrine components, connective tissue Connective tissue Connective tissues originate from embryonic mesenchyme and are present throughout the body except inside the brain and spinal cord. Structures important for the epithelial integrity and function involve the basement membrane, the semipermeable sheet on which the cells rest, and interdigitations, as well as cellular junctions. The cells exhibit polarity, having an apical and a basal pole. The skin is composed of surface epithelium Epithelium The epithelium is a complex of specialized cellular organizations arranged into sheets and lining cavities and covering the surfaces of the body. ![]() The epidermis is primarily composed of keratinocytes that undergo rapid turnover, while the dermis contains dense layers of connective tissue Connective tissue Connective tissues originate from embryonic mesenchyme and are present throughout the body except inside the brain and spinal cord. The skin is primarily composed of the epidermis (outer layer) and dermis (deep layer). The skin, also referred to as the integumentary system, is the largest organ of the body.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |