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1. THE LIVING WORLD

1. THE LIVING WORLD   Life is a unique, complex organization of molecules, expressing through chemical reactions which lead to growth, development, responsiveness, adaptation & reproduction. Properties of living organisms 1.                                                                          Growth ·       It is the increase in mass and number of cells. ·       In plants, growth by cell division occurs continuously throughout their life span. ·       In animals, growth is only up to a certain age. Ho...
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parts of the inner ear: 1. vertibular apparatus         1. semicircular canals         2. utricle and         3. saccule 2. cochlea The inner ear also contains a complex system called vestibular apparatus, located above the cochlea. The vestibular apparatus is composed of three semi-circular canals and the otolith (macula is the sensory part of saccule and utricle). Each semi-circular canal lies in a different plane at right angles to each other. The membranous canals are suspended in the perilymph of the bony canals. The base of canals is swollen and is called ampulla, which contains a projecting ridge called crista ampullaris which has hair cells. The saccule and utricle contain a projecting ridge called macula. The crista and macula are the specific receptors of the vestibular apparatus responsible for maintenance of balance of the body and posture.
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