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The digitalis glycosides are the only orally active positive inotropic agents currently available. The positive inotropic occurs through inhibition of the enzyme Na+-K+-ATPase leading to an increase in the cytocyclic Ca2+ concentration resulting in a subsequent increase in previously reduced myocyte contraction (Hurst). It reduces heart rate via parasympathomimetic effects that is useful in enhancing ventricular filling and reduces pulmonary congestion.
What is the stage of the cardiac cycle during which the ventricles are filled? The filling of the ventricles with blood happens during diastole. The Circulatory System - Ima
Explain the term Microfilaments ? Microfilaments are fine fibrils, only 7 nm in diameter, composed of a protein called actin. Actin is one of the two major proteins involved
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Testing whether roots absorb water and suspended solids Three same plants are inserted into test tubes having 1, water; 2, red ink; 3, a suspension of Congo red. After a some d
Atherosclerosis, the most common part of hardening of the arteries, is characterized by the presence of cholesterol-rich arterial thickenings (atheromas). This progressive diseas
Explain the Bio availability of Vitamin A? By now it is clear that vitamin A is supplied in two forms. One form is retinol, from animal foods such as liver, fatty fish, eggs, a
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Q. How does the inflammation mechanism work? When some tissue injury other vasoactive and occurs histamine substances (called mediators of inflammation) are released, they caus
Compare the modes of intercellular communication used by the endocrine and nervous systems and discuss the functional significance of the differences between the two systems.
Types of Cleavage a) Radial Type : If each of the blastomeres of upper tier lies exactly over the corresponding blastomeres of the lower tier the pattern of cleavage is radia
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