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In biology, tissue is an assembly of similar cells and their extracellular matrix from the same embryonic origin that together carry out a specific function. [1] [2] Tissues occupy a biological organizational level between cells and a complete organ. Accordingly, organs are formed by the functional grouping together of multiple tissues. [3]
He coined the term cell (from Latin cellula, meaning "small room" [41]) in his book Micrographia (1665). [ 42 ] [ 40 ] 1839: Theodor Schwann [ 43 ] and Matthias Jakob Schleiden elucidated the principle that plants and animals are made of cells, concluding that cells are a common unit of structure and development, and thus founding the cell theory.
Epithelium or epithelial tissue is a thin, continuous, protective layer of cells with little extracellular matrix. An example is the epidermis, the outermost layer of the skin. Epithelial (mesothelial) tissues line the outer surfaces of many internal organs, the corresponding inner surfaces of body cavities, and the inner surfaces of blood vessels.
Moreover, this allows cells of the same type to aggregate and form tissues, then organs, and ultimately systems. The G1, G2, and S phase (DNA replication, damage and repair) are considered to be the interphase portion of the cycle, while the M phase ( mitosis ) is the cell division portion of the cycle.
The earliest vascular plants had stems with a central core of vascular tissue. [3] [4] This consisted of a cylindrical strand of xylem, surrounded by a region of phloem. Around the vascular tissue there might have been an endodermis that regulated the flow of water into and out of the vascular system. Such an arrangement is termed a protostele.
Trump aims to shift the aggressive trade agenda from his first term into higher gear with across-the-board 10% tariffs on imported goods and even higher levies on imports from China.
The Health Resources and Services Administration's National Center for Health Workforce Analysis projects a 10% shortage of RNs in 2026 and 2031, dropping to 9% in 2036, based on a report released ...
A respiratory pigment is a metalloprotein that serves a variety of important functions, its main being O 2 transport. [1] Other functions performed include O 2 storage, CO 2 transport, and transportation of substances other than respiratory gases.