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Q. What is Sick Sinus Syndrome?
Ans.
When a slow resting pulse fails to accelerate normally with exercise, it has been labeled chronotropic incompetence, however, there is little doubt that the understanding of this syndrome is incomplete. A slower than normal acceleration of the heart rate during exercise would be a protective mechanism in ischaemia, assuring a longer diastolic time to perfuse the myocardium. It is found that the reduced hear rate response to exercise identifies a cohort of patients with poor ventricular function many of whom have severe coronary narrowing and are subject to an increased prevalence of future coronary events.
Into which two groups can the nitrogen-containing bases that form DNA and RNA be classified? What is the criterion used in that classification? The nitrogen-containing bases th
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Temperate rain forests - Ecosystem The temperate rain Forests are colder than any other rain forest and exhibit a marked seasonality with regard to temperature and rainfall. R
Which of the following is true for a toe corticospinal interneuron that produces action potentials during voluntary movements of the big toe of the right foot? A. Its dendrites
GOLGI APPARATUS Camillo Golgi in 1898 discovered a reticular structure in the cytoplasm of nerve cells with the help of metal impregnation technique using silver nitrate for whic
Define Polyacrylamide gel electrophoresis (PAGE)? Acrylamide gel has the advantage over starch in that it is easier to prepare and is more inert, the pore size can be varied in
ABSORPTIO N OF FOOD Absorption from Mouth Here negligible tobacco, alkohal and some medicines as isoprenailne glycerol tri nitrite is absorbed. Absorptio n from Sto
What is tahe excretory organ of Agama lizard
Autochory - Dispersal of Seeds This mechanism of self-dispersal is based on forceful expulsion of the seed from the fruit because of desiccation or turgidity of the cells of
How different are the endosperm of gymnosperms and the endosperm of angiosperms? In gymnosperms the endosperm is haploid (n), it is known as primary endosperm. In angiosperm th
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