• Zoology

    MUSCULAR SYSTEM

    Locomotion is important to all organisms for various purposes like to find food, to mate, to escape from predators, for survival purpose, etc. and altogether, they influence in locomotive organ evolution process in animals. Locomotive organs are different in nature from one species to other. Muscles play important role in movement of the animals. In higher animals along with muscles, bones also associate for the movement. Animal movements can differentiate as walk, run, swim, fly, crawl and jump. Bacterial movement can classify as flagellar, spirochaetal and gliding movement. Single cell organisms also show crawling like movement often called amoeboidal movement as well as they show cillary movement, flagellar movement. Nature…

  • Biochemistry

    HUMAN NERVOUS SYSTEM

    The origin of human nervous system is ectodermal. The whole nervous system is divided into three parts. Central Nervous System It comprises the brain and the spinal cord. Brain Brain accommodate in the skull while spinal cord is enclosed by the vertebral column. To support brain and protect it from external pressures, it is surrounded by a covering of triple membrane of connective tissue called the meninges. The three layers of meninges are duramater, arachnoid and piamater. The innermost layer, piamater is thin, delicate and highly vascular. It is firmly adhere to the brain. The middle layer is arachnoid membrane, which is thin and highly folded structure in front of…

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