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  • An organ is a complex system of tissues working together to perform a life task for a living organism .
  • The integumentary system comprises of human skin. It protects the body from infection and keeps the body from losing water.
  • The immune system protects our body from all pathogenic infection by producing the T cells and the B cells.
  • A group of cells, alike in size and shape, having the same origin and performing a particular function, is called a tissue.
  • Meristematic tissue consists of cells which are not differentiated and which are capable of cell division.
  • Intercalary meristems occur between regions of permanent tissues and at nodes on the stem
  • Sclerenchyma is made up of dead cells which have very thick walls. The walls are thickened due to the deposition of cutin and lignin.
  • Sclereids are a type of sc lerenchyma cells also called as stone cells. They are mostly irregular in shape.
  • There are two types of complex permanent tissues in plants, namely xylem and phloem. They are the conducting or vascular tissues.
  • Xylem consists of different kinds of cell, namely, tracheids, vessels, xylem fibres and xylem parenchyma.
  • Trachea are otherwise known as vessels. They are also water-conducting elements and form the bulk of the conducting tissues in flowering plants.
  • Phloem consists of sieve tubes, companion cells, phloem parenchyma and phloem fibres.
  • Companion cells assist the sieve tubes in conduction of food.
  • Blood consists of a fluid plasma and blood cells - erythrocytes, leukocytes, and thrombocytes.
  • Contraction of cardiac muscle fibers is involuntary. It is located in the heart wall.
  • Nervous tissue consists of cells called neurons and neuroglia, located in the brain, spinal cord, and nerves. Its function is to produce and conduct nerve impulses.

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