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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).
Q.Explain about Stress Testing in Women? Data on mortality in men is about 2.5 times that of women. At younger ages, however, CAD in men exceeds that found in women by 5 to 1.
Why do protease-supplying cells of the stomach and of the pancreas make only precursors of the active proteolytic enzymes? The stomach and the pancreas make zymogens of the pro
Production of haploids by tissue culture,
Oogenesis The process of formation of ova in the ovary is called as oogenesis. The germ cells are found in the form of germinal epthelium around the ovary.These cells are d
INTRODUCTIO N - Fertilization is a complex process which involves fusion of male & female gametes. The male gamete in animals is called as sperm & the female gamete as o
M A TERNIT Y AND CHILD HEALTH & FAMILY PLANNING - 1. The health centers give necessary information, guidance & assistance to mother before & after delivery pregnant wo
what is the problem that the theory of evolution and its rival theories try to solve?
Toxoplasmosis Toxoplasmosis, one of the important parasitic zoonoses, occurs all over the world, and is caused by a protozoan parasite Toxoplasma gondii. Its definitive hosts are
Neurosurgery An antistaphylococcal antibiotic can decrease the incidence of infection after craniotomy. In spinal surgery, the infection rate after conventional lumbar discecto
What is the importance of vitamin A The importance of vitamin A is undisputable. You may already be aware about the functions/role of vitamin A in our body. Vitamin A is absol
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