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Baroreceptor activity affects coronary vascular resistance reflexly. With carotid occlusion, baroreceptor hypotension leads to reflex adrenergic stimulation, increased metabolic activity and secondary vasodilation. When this is prevented by beta blockade, reflex coronary vasoconstriction secondary to carotid hypotension is unmasked. Alpha1 adrenoreceptor stimulation is capable of causing epicardial vasoconstriction in ischaemic myocardium, thereby influencing favourably the transmural distribution of blood flow to the subendocardium during exercise. Activation of chemoreceptors initially causes coronary dilation, a reflex that is mediated by vagi and can be abolished by atropine e.g. Bezold Jarisch reflex.
Define Endocrine or Hormonal Disorders - Infertility Infertility can be caused by endocrine disorders, long-term sequelae of sexually, transmitted infections, puerperal sepsis,
ARTIFICIA L SELECTION - Man selects the individuals having the desired traits and separates them from those, which do not possess such characters. The selected ones are
Select the two correct statements out of the four (a - d) given below about lac operon. 1. Glucose or galactose may bind with the repressor and inactivate it 2. In the absenc
Pulmonary Valvotomy on Cardio Pulmonary Bypass : Patient is connected to cardio pulmonary bypass using ascending aortic cannula and single 01- double (preferred) ven
PANCREA S - It is derived from the endoderm of the embryo. Structure . The pancreas lies inferior to the stomach in a bend of the duodenum. It is both an exocrine an
What are the major plant tissues that form the rings observed on stem sections of some trees? The rings observed on a stem cross section of the dicot trees are made of conducti
Interferons are small glycoproteins formed by virus-infected cells that inhibit viral infection. They are heterogeneous. Gamma interferons induce MHC class II antigens in macrophag
using either nested brackets as a cladogram, what are the hierarchical relationships among the followingtaxa:raniates, amniotes, mammals, actinopterygians, chondrichthyes, aves, ve
Explain the work of Linnaeus in animal Taxonomy? In 18th century, the work of Linnaeus and his followers (Haartman, 1751, 1764, Kolreuter, 1761-66) helped systematic to advance
Ecological adaptations in animals to desert environment In response to scarcity of water, animats adcipt vario6s strategies to conserve or prevent loss of water. Most of the de
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