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Recent Trends on Ageing – Biological or Physiological Perspective

Herbert G. Lyngdoh, T. Challam, V. M. Wann, D. G. Soanes

Abstract


Life span is a continuum of development and growth at one end and deterioration of functions or senescence or aging at the other end. In between is the reproductive phase or adulthood. Life span can be defined as the duration of life of an individual or organism in a particular environment. The life span of a multicellular organism may be broadly divided into three phases: development (growth), reproductive period (adulthood) and senescence (aging). The time of onset, duration and rate of each phase is dependent on the vigour and vitality of the other, and are therefore interrelated. Development normally involves both quantitative and qualitative changes leading to suitable specialization of various cells, tissues and organs of the body, which is usually referred to as differentiation. The development of many animals is divided into prenatal and postnatal periods. For many years, attention was focused on events taking place before birth, when the most striking advances occur in the animals. Prenatal and postnatal stages are characterized by certain distinguishing features, such as morphologic, physiologic, biochemical and psychological features.

Keywords


age, growth, heredity

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References


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DOI: https://doi.org/10.37628/ijmb.v1i1.41

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