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Regulation of Heart
The number of electrical impulses initiated by the SA node is primarily the result of its innervation by fibers from both sympathetic and parasympathetic branches of the autonomic nervous system. Sympathetic branch have a positive chronotropic effect (increase in rate) while parasympathetic branch have a negative chronotropic effect (decrease in rate). Parasympathetic innervations occurs by way of the vagus nerve. Sympathetic nerve fibers, when stimulated release norepinephrine at the nerve endings and comprise what is called the adrenergic system.
The central nervous system regulate the heat through the cardiac center in medulla and the hypothalamous.
how energy enters and then flows through a biological system
Oreopithecus, a late rniocene primate had very close resemblances to those of gibbons, although the tooth structure showed that the animal was only a monkey and not a hominoid. Ano
What are deciduous trees? Deciduous trees are plants that lose their leaves in a period of the year. In the case of the deciduous trees of the temperate forest the fall of the
STRUCTURE OF WATER It may interest you to know that water is a universal solvent and is a major constituent of all living organisms. Earth is the only planet where water exists i
Embryonic Development The embryonic stage extends from the second week by the 8th week and is charactrised by formation of placenta, the development of internal organs and ap
Explain the Methodology for seliwanoff test? Take 5 ml of seliwanoff's reagent in a test tube. Add 5-6 drops of the glucose solution and heat the mixture to boiling for about 3
Where does most of the water resorbed after glomerular filtration go? What are the other substances resorbed by the nephron tubules? Only 0.5 to 1% of the glomerular filtrate i
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Explain Problems of Infants and Preschoolers Nutrition? In spite of all nutrition interventions, there are some of the common yet life threatening problems which need to be loo
Initiation of Aseptic Cultures The nutrient medium (basal medium) used for plant tissue culture would promote luxuriant growth of micro-organisms such as bacteria and fungi. W
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