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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.
Q. What is hematosis? In humans where does hematosis occur? Hematosis is the oxygenation of the blood, venous blood (oxygen-poor) after hematosis is transformed into arterial b
Explain about the term accommodation. Normally, the human eye focuses at objects at infinity, without exerting any power. This implies that while a person is observing an objec
Cell Determination Cell determination is a process through which portions of embryonic genome are selected for expression in particular embryonic cells. Determination to follo
Q. How many ATP molecules are made after glycolysis? Glycolysis is a process similar to glucose degradation in fermentation it produces final balances two molecules of ATP for
Q. Of what substance is the plant cell wall made? Of which monomer is it made? The plant cell wall is made of cellulose. Cellulose is a polymer whose monomer is glucose. There
The nerve centres which control the body temperature and the urge for eating recontained in: 1. Hypothalamus 2. Pons 3. Cerebellum 4. Thalamus Hypothalamus is the
Which of the following is not true regarding the complement system?Answer This system involves a group of at least 20 proteins found in the blood plasma. During an infection, one p
information on some heterotrophic plants
Determination of Limb Polarities The limb pattern is characterized by three axes (or polarities) as displayed in diagram: (1) The direction from the shoulder (or hip) to t
list out sex limited traits in farm animals
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