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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.
Q. What is protocooperation? The Protocooperation is the ecological interaction in which both participants benefit but which is not obligatory for their survival. The Protocoop
Which of the following variations on translation would be most disadvantageous for a cell? A) translating polypeptides directly from DNA B) using fewer kinds of tRNA C) having only
Gene targeting in ES cells: In some of the livestock species pro-nuclear injection cannot be used to modify the animals' own genes due to various reasons especially non availabil
Adverse effects of lamivudine Because lamivudine is also active against hepatitis B virus (HBV), HIV-positive patients with chronic HBV infection may experience a flare of hep
Unsaturated fatty acids Unsaturated fatty acids are liquid at room temperature and are characterized by having one or more double bonds. Fatty acids having two or more
What structure does the sheath replace in a dicot?
State the term - Aneurysms Aneurysms are vascular dilations resulting from localised defects in the elasticity of a vessel. They can be visualised as balloon like expansions of
Explain the Solid-Liquid Equilibria? A freezing-point curve (freezing point as a function of liquid composition) and a solubility curve (composition of a solution in equilibriu
CELL MEMBRANE As discrete units of life all living cells are separated from each other and from their external environment by an extremely delicate (75 A to 100 a= 0.00075 to
How different is the amphibian heart from the fish heart? The fish heart has only two chambers, a ventricle and an atrium, and the blood that comes to it is purely venous. I
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