Answer:
He meant that the supporting cells form a insulating coat on the nerve fibre called myelin seath. The myelin Sheath act similar to the rubber coating of household wiring because it electrically insulates the nerve fibre and speeds of conduction of nerve impulse..
Explanation:
- The supporting cells of the nervous system are together called neuroglia or glial cells.
- Unlike neurons these cells can divide in the mature nervous system and do not conduct nerve impulse.
- Out of six types of glial cells, four are located in the central nervous system (CNS) and they are;astrocytes, oligodendrocytes, ependymal cells and microglia.
- The remaining two types are the part of Peripheral nervous system (PNS) and include Schwann cells and Sattelite cells.
- Among these , the oligodendrocytes of the CNS and Schwann cells of the PNS forms myelin sheath on the axons of the nerve cell that act similar to the rubber coating on the household wiring.
- The myelin sheath electrically insulates the axon of a neuron and increase the speed of conduction of nerve impulse.
the illuminatti cloning facility can clone anything
look at basket ball football and track all robots
Answer:
Directional
Explanation:
In population genetics, for natural selection to occur there must be a variation that will favor the survival of an individual.
Directional selection is a form of natural selection that occurs in the extreme end when an environment condition such as food favors one phenotype over the other.
This will make the allele Frequencies to shift towards the direction of the superior phenotype.
Answer:
(Feeling sad or miserable most of the time)When you're going through a tough time it's normal to feel down for a while, emotions like sadness and grief help make us human. But if you're feeling sad or miserable most of the time over a long period of time, you might have depression.
Explanation:
Family history. Though there are no specific genes that we can look at and trace to depression, if your family members have had depression, you are more likely also to experience depression. ...
Illness and health issues. ...
Medication, drugs, and alcohol. ...
Personality.
