Answer:
B
Explanation:
O Resting potential
O Moving potential
O Threshold
Answer:
Resting potential
Explanation:
Glial cells are not part of the nerve impulse reaction; they provide support and insulation in the nervous system. Resting potential, action potential, and threshold are all directly involved in the nerve impulse conduction.
The component that is NOT part of the nerve impulse reaction among the given options is Glial cells. The other options, such as resting potential, moving potential (commonly referred to as action potential), and threshold, are all directly involved in the generation and propagation of a nerve impulse.
Resting potential refers to the difference in electrical charge across the plasma membrane of a neuron when it is not actively transmitting a signal. It is sustained by the sodium-potassium pump which helps maintain the distinct concentrations of sodium (Na+) and potassium (K+) ions inside and outside the cell. When the neuron is stimulated and the threshold is reached, voltage-gated Na+ channels open, causing an action potential by reversing the electrical charge across the membrane, allowing the nerve impulse to propagate along the neuron.
Glial cells, such as astrocytes and oligodendrocytes as shown in Figure 35.8, are supportive cells in the nervous system. They provide structure, nutrition, insulation, and help with signal transmission by myelinating axons, but they do not participate in the actual electrical signal or impulse that characterizes neuron communication.
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Answer:
The flu virus changes every year.
Explanation:
The virus that causes the flu mutates rapidly. Each year, a different flu strain causes the flu, which explains why you need to get a new flu shot every year. The antibodies you produced in response to last year's flu shot won't protect you from this year's flu. It is difficult to keep up with a quickly evolving virus like the influenza virus.
Doctors recommend annual flu shots to deal with the constant evolution and mutation of flu viruses. The rapid mutation rate of the flu virus requires the development of new vaccines each year to combat emerging strains. This process allows the flu shots to help control and mitigate flu outbreaks.
Doctors recommend getting flu shots each year due to the constant evolution and mutation of influenza viruses. Each year, scientists across the globe try to predict the flu strains that will be the most widespread and harmful. This prediction is based on how flu strains have evolved over time and over the past few flu seasons.
Several viruses, such as the flu, mutate and replicate at a rapid pace. The vaccine developed to protect against last year's flu strain may not offer protection against the coming year's strain due to the virus's evolution and adaptation.
The high rate of mutation in flu viruses makes it particularly difficult for the immune system to recognize different strains. Although the body may develop immunity to one strain through natural exposure or vaccination, new strains keep emerging that the immune system won't recognize.
The virus's surface molecules mutate, causing the flu to alter sufficiently each year such that the previous year's vaccine may not protect against the coming year's common flu. Therefore, new vaccine formulations need to be derived for each flu season.
Every year, new flu vaccines are developed to be effective against the expected dominant strains. These strains are typically cultivated in eggs and used to produce either an inactivated or a live attenuated vaccine. Through this process, annual flu shots aid in controlling influenza outbreaks.
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A. one week
B. one month
C. two months
D. two weeks
Everyone feels sad or blue, but if the feelings persist for longer than two weeks, you should see a professional. Thus, the correct option is D.
Feeling blue or being down in the dumps are the ways through which we describe our feelings of sadness or melancholy. True depression has a host of other symptoms as well in addition to sadness and anxiety.
It is important to talk to your doctor if you experience sadness for a longer period than two weeks. And, call the emergency services to receive immediate medical help if a person is having killing self thoughts. If the feelings interfere with an individual's ability to function, then one should take part in life, or experience enjoyment and other things to cope up with it.
Therefore, the correct option is D.
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