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Q. What are the cells that produce the myelin sheath? Of which substance is the myelin sheath formed?
In the central nervous system (CNS) the myelin sheath is made by apposition of oligodendrocyte membranes each oligodendrocyte can cover portions of axons of several different neurons. In the peripheral nervous system (PNS) the myelin sheath is made by consecutive Schwann cell membranes covering segments of a single axon the Ranviers' nodes appear in the intercellular space between these cells. The myelin sheath is rich in lipids but it also contains proteins.
a) Water demands vary among communities. Discuss some of the factors affecting water uses. b) A coastal town has a resident population of 8000 people during the winter months
Define The Names of Some Immemorial Plants? From the time immemorial plants have been known by some name, they are common, vernacular or local names given by different persons.
important of biology to man
What are the grasslands of North America and of South America respectively called? The steppe the grasslands of North America are called as prairies . The grasslands of South
Draw a diagram of transverse section of mammalian bone and label the following parts in it: (i) Haversian canal (ii) Lacuna containing osteocytes (iii) Canaliculi
The DNA of a bacterial cell,such as Escherichia coli is a circular double-stranded molecule often referred to as the bacterial chromosome. The circular DNA is packaged into
Which of the following defines why the vast majority of segregation errors in human patients include the two sex chromosomes (XXY, XO, XYY) or chromosome 21 (triple 21)? A. The
Q. What are the three phases into which the HIV infection is often divided? The HIV infection is frequently divided into three phases the acute phase, from the infection to 1 u
Differential reinforcement of other behaviour (DRO) This is used to decrease frequent behaviour by reinforcing any behaviour other than the undesired one. An instance would be r
If you look up a world atlas you would notice that most of the earth's surface is covered by the waters of the oceans (about 71%). Beneath the water surface is a fascinating world
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