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What is the virus that causes flu? Why doesn't the body create permanent immunity against that virus? How does the vaccine against flu work?
Flu is a disease caused by the influenza virus, a highly mutant DNA virus. Because of the high mutation rate of the virus, that forms many dissimilar strains, flu always presents epidemic features in affected populations and people may have some flu episodes during life (the immune response made from previous infections is not efficient in future infections).
The vaccine against flu is a vaccine made of attenuated virus of three dissimilar strains. Each year the WHO (World Health Organization) researches and determines which are the strains that should compose the vaccine. This is a method to face the high mutation rate of the virus.
What is digestion? The ingested food material is broken down into smaller constituents which are assimilable by the blood. The process through which the major nutr
Hyperglycaemic:- In the fasting state, glucose release from the liver increases due to the action of glucagon and in the muscle by epinephrine. Glucagon also enhances glucone
y it was critised
It is the preparatory phase. Cell organelle replicate and size of the cell increases. DNA molecule undergoes replication. Each chromosome exists as a pair of chromatids joined toge
Degradation of Ecosystem Ancient man was simple-minded food gatherer and hunter. He looked upon nature with awe and respect and in fact he worshipped it. But from the time he
Q. How to investigate aortic stenosis by Echo Cardiography? 2D Echo cardiogram shows the number of cusps. But presence of raphae and distorted anatomy due to calcification may
Explain the Stages In Taxonomic Procedures? Divided into three levels or phases: 1) Alpha (α) phase, 2) Beta (β) phase, 3) Gamma (γ) phase. Alpha Taxonomy The
GIVE ADETAILED ACCOUNT OF THE VARIETY OF FUNCTIONS PERFORMED BY THE LIVER
Jet Lag Disturbance of body and environmental rhythms resulting from a rapid change in time zones gives rise to jet lag, which is characterized by insomnia, decreased quality
Synthesis and Storage of Hormone The synthesis and storage of hormone depends on the nature of the hormone. Steroid hormones are secreted in diffuse molecular form and usually
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