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cells

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cells

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  1. cells

  2. The cell is the structural and functional unit of all known livingorganisms. It is the smallest unit of an organism that is classified as living, and is often called the building brick of life.[1] Some organisms, such as most bacteria, are unicellular (consist of a single cell). Other organisms, such as humans, are multicellular. (Humans have an estimated 100 trillion or 1014 cells; a typical cell size is 10 µm; a typical cell mass is 1 nanogram.) The largest known cell is an unfertilized ostrich Information on cells/tissues The cell is the structural and functional unit of all known livingorganisms. It is the smallest unit of an organism that is classified as living, and is often called the building brick of life.[1] Some organisms, such as most bacteria, are unicellular (consist of a single cell). Other organisms, such as humans, are multicellular. (Humans have an estimated 100 trillion or 1014 cells; a typical cell size is 10 µm; a typical cell mass is 1 nanogram.) The largest known cell is an unfertilized ostrich In 1835 before the final cell theory was developed, a CzechJan Evangelista Purkyně observed small "granules" while looking at the plant tissue through a microscope. The cell theory, first developed in 1839 by Matthias JakobSchleiden and Theodor Schwann, states that all organisms are composed of one or more cells. All cells come from preexisting cells. Vital functions of an organism occur within cells, and all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.[3]

  3. tissues Tissue is a cellular organizational level intermediate between cells and a complete organism. Hence, a tissue is an ensemble of cells, not necessarily identical, but from the same origin, that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues. Connective tissues are fibrous tissues.They are comprised of cells separated by non-living material, which is called extracellular matrix. Connective tissue holds other tissues together such as in the formation of organs, and has the ability to stretch and contract passively. Bone, often referred to as osseous tissue, and blood are examples of specialized connective tissues Muscle cells form the active contractile tissue of the body known as muscle tissue. Muscle tissue functions 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, in which is found attached to bone providing for gross movement; and cardiac muscle which is found in the heart, allowing it to contract and pump blood throughout an organism.

  4. HEAR IS SOME PICTURES OF TISSUES The growth of plant occurs only in certain specific regions. At these s, the meristimatic tissues are present. New cells produced by meristem are initially those of meristem itself, but as they grow and mature, their characteristics slowly change and they become differentiated as components of other tissues. TISSUES

  5. HOW THE BODY WORK`S The heart is essential for your survival! Your heart is constantly working, even when you are resting. The heart, blood and blood vessels together make up the circulatory system. The heart pumps the blood through the blood vessels to all the different tissues of the body. This blood carries water, oxygen and nutrients. Blood is also important for removing waste products from the body. The heart sits between the lungs in the chest, where it is well-protected by the rib cage.

  6. ORGANS A group of related organs is an organ system. Organs within a may be related in any number of ways, but relationships of function are most commonly used. For example the urinary system comprises organs that work together to produce, store, and carry urine. Usually there is a main tissue and sporadic tissues. The main tissue is the one that is unique for the specific organ. For example, main tissue in the heart is the myocardium, while sporadic are the nerves, blood, connective etc.. Functionally related organs often cooperate to form whole organ systems. Organs exist in all higher biological organisms, in particular they are not restricted to animals, but can also be identified in plants. In single-cell organisms like bacteria, the functional analogues of organs are called organelles.

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