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ENDOPLASMIC RETICULUM (ER)Eucaryotic celIs have two major compartments- nucleus and cytoplasm. Cytoplasm was known to have no structure until the discovery of electron micrsscope. That cytoplasm is permeated by a membranous network called endoplasmic reticulum (ER), was revealed only after the introduction of electron microscope. Endoplasmic reticulum is a three dimensional network of membrane channels which constitutes more than half of the total membrane of the cell, ER is a highly folded and convoluted structure and forms a single continuous sheet enclosing one continuous sac. The interior of the sac is called "cisternal space" or "ER lumen". This is separated from the cytoplasm also called cytosol by a single membrane which mediates the communication between these two compartments. ER provides the cell with a compartment for storage of substances to be kept separate from cytosol. In addition, it has a key role in the biosynthesis of macromolecules. ER is a double membranous organelle which consists of interconnecting flattened sacs called cisternae or interconnected tubules or vesicles. Cisternae are temporary storage sites for nutrients (Figure shown below).
What are stains? Microorganisms are difficult to be seen in living state because of their minute, colourless and transparent nature. Moreover, there is limitation of insufficie
How would carbon monoxide poisoning affect a person's coloring, particularly of the mucous membranes? How would it affect the hemoglobin concentration, hematocrit, and percent oxyh
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Explain Community dietitians Community dietitians or nutritionists may counsel individuals and groups on sound nutrition practices to prevent disease, maintain healt
What is ammensalim? Ammensalism is the ecological interaction in which an individual harms another without obtaining advanatage. Ammensalism is an inharmonious (negative) ecolo
Question 1 List the cells and organs involved in immune system. Explain the role of thymus in development of T cells. Add a note on recognition of self antigens by immune system
Stratification - Aquatic ecosystems Aquatic ecosystems also exhibit marked stratification. In lake and ocean ecosystems light penetration, temperature and availability of oxyg
#Most of the world''s flightless birds are either nocturnal and secretive (e.g. the kagu) or large, swift and well-armed (the ostrich). The exceptions are found primarily on island
Q. How do ascaris obtain food? An ascaris live within the human gut and feed from the food ingested by the infected person.
Pulse Oximetry: Procedure: Pulse Oximetry is a safe and simple method of assessing oxygenation. An advantage is that this method is noninvasive and continuous. Previously,
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