A group of nerve cell bodies outside the central nervous system of the body is called as ganglion. The nerve is an enclosed cable like bundles of axons. A neuron is a nerve cell (electrically excitable) that receive, process and transmit signalling information through electrical and chemical signals. The tracts are the bundle of fibers that connects nuclei of the central nervous system. The nerves, neuron and tracts are present outside the central nervous system. Hence, only ganglia persists in the central nervous system.
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A Mutation is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed.
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The correct answer is A. The larynx moves up against epiglottis when food is swallowed to prevent passage of food into it.
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The epiglottis is a moist, cartilaginous structure that is part of the cartilaginous skeleton of the larynx. It also marks the boundary between the oropharynx and the laryngopharynx. The epiglottis obstructs the passage of the bolus at the time of swallowing preventing it from going to the respiratory system.
Larynx closure occurs when the vestibular and vocal folds approach the midline during swallowing. Occasionally, when you eat very fast, solid foods or liquids can enter the larynx.
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yes he did ,
In 1873, Joseph Lister isolated the first bacterial pure culture which he called Bacterium lactis. This lactic acid bacterium is now called Lactococcus lactis and is used for fermenting milk to produce hundreds of different dairy products.
-In Africa savanna more wildebeest are born than the environment can support. As a result over a period of years individuals that are well suited to the environment reproduce, and those that have lesser adaptations die before they reproduce. This is referred to as natural selection.
