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CinemicrographyEarlier it was impossible to follow the evenvts within the cell due to:i) non-visibility of cell organelles under a light microscope,ii) maintenance of cells outside the body, and
iii) slow nature of events, like cell division or cell locomotion.It was not possible earlier to follow the events within the living cells. The first difficulty was overcome by the development of phase contrast microscopy and second was removed by the tissue culture technique. The third problem was solved with the onset of cinemicrography.In cinemicrography the events in or about cells are continuously filmed by a camera attached to the eye piece of a microscope. The speed of exposure per unit time can be varied according to requirement. By an appropriate combination of the speed of exposure and the speed of viewing the film it is possible to see events that took 1 hour in just 1 min or 5 sec. This is very useful in making the observation on mitosis, cytokinesis, cell movement etc. On the contrary, in other cases, fast events can be slowed down for viewing, for example, the movement of cilia or flagella.
Define Endocrine or Hormonal Disorders affect the Reproductive Tract Endocrine or hormonal disorders can affect several aspects of reproduction, from menstruation to fertility.
Functions of the Vascular System The major function of the circulatory system is to provide a transport mechanism for the blood flow to and from the heart. The vascular syste
These are safe and free of systemic side effects. However, gastrointestinal side effects are common, and compliance is poor. The average LDL decreases by approximately 15 per cent
CAR E OF EYES - 1. Eyes should be periodically examined in children. 2. While reading the paper should be held 36 cm. away from eyes and preferable at an angle
Skin The skin or integument is the outer covering of the body and have appendages i.e. nails and hairs. The outer layer of skin is known as epidermis; the inner layer is dermis
Q Which are the extra abundant ribosomes in secretory cells - the free cytoplasmic ribosomes or those associated with the rough endoplasmic reticulum? Free cytoplasmic ribosome
Cell theory is a theory that asserts that the cell is the ingredient unit of the living beings. Before the discovery of the cell, it was not examined that the living beings were
What is (a) the male gamete, and (b) the female gamete in a flowering plant? (a) The male gamete in a flowering plant is the pollen grain (strictly, the gamete is the male
Q. What are the enzymes? What is the significance of enzymes for living beings? Enzymes are proteins that are catalysts of the chemical reactions. From Chemistry it is known as
Slow creeping
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