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What is the cell/tissue/organ/system

Cell: It is the  smallest living organism in our body

Tissue: It is consist of same kind of cells. 

Organs: It is consist of same kind of tissues

System: It is consist of organs which have the same aims. Digestive , respiratory systems etc.  

Cell-the cell is the basic unit of all life and is responsible for chemical synthesis, respiration, and other simple activites. When many cells of the same type are together, they form tissues.

Tissues work together to preform a small task, such as muscle tissue contracting. The main function of a tissue however, is that together, it makes up an organ.

An organ can serve a variety of essential functions an organism needs to survive, (eg. your heart, lungs, brain, kidney, liver, ect. are all organs) When many organs work together, it is known as an organ system

An example of an organ system would be the digestive system. The stomach, small and large intestines, kidneys, and kidney are all responsible for the breaking down of food.

What its role in the normal functioning of the human organism and its contribution to maintenance of homeostasis

Morphogenesis is the generation of complex biological form through coordinated changes in the size, shape and positioning of groups of cells. The guided migration of cohesive groups of cells is a hallmark of embryonic morphogenesis. While such collective migrations determine the shape of most organ systems and are a common feature of wound repair, regeneration and cancer, they are still poorly understood. (Tallis 2008)

The zebrafish lateral line primordium is a migrating cluster of some two hundred cells whose function is to generate and disperse mechanosensory organs throughout the embryonic skin. Cells in this moving tissue must multitask - they migrate, grow, divide and differentiate simultaneously. The lateral therefore provides a powerful model system for addressing how complex form arises through the interplay of basic cellular behaviours. In recent years we have developed a number of in vivo imaging and perturbation tools that allow this entire morphogenetic process to be addressed at sub-cellular resolution in the context of the intact, living embryo.

Genetic screens have lead to the isolation of a number of signalling molecules required for primordium migration. The primordium is guided by the chemokine Sdf1 and its receptor Cxcr4, a signalling pathway that is known to regulate the invasive behaviour of many human tumours. Furthermore, cells within the primordiumare assembled into rosette-like organ progenitors via a dynamicmesenchymal-epithelial transition that is driven through spots of FGF-ligand that repeatedly appear within the tissue as it migrates. (Spirduso2009)


what are the anatomical, physiological,chemical, and cellular mechanisms behind the structures, or performance parameter

Intracellular recordings were made in the VIIIth nerve of the bullfrog (Rana catesbiana) to measure the membrane characteristics and obtain records of spontaneous and evoked spike activity of primary semicircular canal afferents. Physiological stimulation of the canals was achieved by rotating the preparation on a servomotor driven turntable with the animals' head centered in the rotational axis. The responses of each neuron to sinusoidal rotations at frequencies of ...
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